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To swear or curse in a situation where it is not appropriate.

Named after the band called Deaf Lemon who famously swore on stage in front of an audience of 10,000 children and families and caused great offence .
Interviewer: So why do you think you would be good in this position.

Bob: Cos I'm fucking awesome at this kind of shit.

Sandy: How did the interview go Bob?

Bob: It was going great until I pulled out a Deaf Lemon.
by dirtyboy123 May 10, 2010
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