A half of all Brits exaggerate their personal details at social events, including salary, job description and wine knowledge.
Research of 2,000 adults found three in 10 adopt a competitive streak at gatherings, and try to out-do other guests, and even the host, with fanciful tales.
Travelling experiences, cooking skills, dating exploits - and even social media followings - are other areas Brits are guilty of over-inflating.
But four in 10 admit they only tend to discuss the positive areas of their lives when they're with others in a social setting.
The research was commissioned by Virgin Wines, which has created a clever 'wine comment generator', to allow bluffers to get away with sounding knowledgeable about the topic.
Virgin Wines' spokesman Andrew Baker said: "Dinner parties look to be generally slightly more intimate affairs for the foreseeable future.
"This means it's difficult to blend into a larger crowd, and people will naturally need to speak a bit more - which can be awkward if you feel you've little to say.
"It's no surprise to find as a result, millions are over-egging their personal achievements somewhat, so they sound a bit more impressive."
The study also found that more than a third (37 per cent) of adults admitted to feeling 'pressured' to impress others at social gatherings.
And while three in 10 let their competitive edge take over so they can try and one-up everyone else at a dinner party, a fifth have called someone else out for doing so.
It's more likely Brits will try and embellish their personal achievements with new people than ones they've known for years - in case they get caught out.
But 43 per cent do it to try and fit in with the crowd they're part of, while another four in 10 just want to appear more interesting than they really are.
A little under half believe a little white lie is perfectly acceptable to tell at a dinner party, according to the OnePoll figures.
However, for 41 per cent of the population, the need to impress others has diminished as they get older in years.
Andrew added: "We can't make your job more interesting or your exploits on holiday any more hilarious.
"But at least we can make it sound like you know what you're talking about when it comes to wine, with our crafty comment generator.
"It will give you a few choice opinions about wine, perfect for any social setting, you can drop in so you'll sound like a master sommelier - even if you can't tell a Merlot from a Mojito."
Bluff you way to being a wine expert here - https://www.virginwines.co.uk/hub/wine-buff-machine/Top 30 things Brits have exaggerated in social situations:
1. Job role
2. Travelling experiences
3. The amount of exercise they do
5. Dating life
6. Cooking skills
7. Past careers
8. Films they've seen
9. Baking skills
10. How happy their marriage/relationship is
11. The number of countries they've visited
12. School grades
13. Books they've read
14. Sport skills
15. Clothes size
16. The amount of money they spend
17. Restaurants they have eaten at
18. Celebrities they have met
19. Past job interviews
20. Music festival experiences
21. University degree
22. Where they shop
23. Their running ability
24. Bands they have seen live
25. Their partner's job/salary
26. The size of their house
27. Their children's school achievements
28. The amount of tech they own
29. The amount of branded clothes they own
30. Their social media followers Top 10 areas in which Brits have exaggerated their knowledge:
9. Celebrity news