when your tongue slips while eating a girl's pussy, and you accidentally lick her anus.
my girlfriend actually liked my slip of tongue yesterday
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Short for, to French kiss a girl using your tongue
Did you slip her the tongue?
v.
to french kiss someone, hence 'slip some tongue' into their mouth.
Jerry: Hey, Emile, slip me some tongue.
Emile: Alright, fairy.
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The language that politicians use to slide around facts and reality.
Our rules and regulations are designed for the benefit of slip tongued politicians and their closest personal friends.