An epic burn. Practice so it willroll right off the tongue and and use when people are drinking so that there will be maximum nasal spewage for effect.
loser: blah blah blah...
cool person: Is your asshole jealous of the shit coming out of your mouth?
When someone is utterly bullshitting their way out of something, commonly the failure to attend an event or to give someone something (i.e. gift, debt, etc.)
Bob: Bro, sorry I missed the party, but my girl was all on me last night!
Mike: Dude, your girl was AT the party last night. I can see the shit dribbling out of your mouth, dude.