A mixture of lmao (laughing my arse off) and pmsl (pissing myself)
Dotty laughing with her friend finished with "pmao" in error instead of lmao or pmsl and the new hybrid word was born!!
by EJC81 May 16, 2011
pooping my pass off
i just PMAO'D
by not andrew or sergio May 21, 2009

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