A mayo smile is a smile in which the person smiles without showing or barely showing their teeth. The way they jut out their bottom jaw looks like a underbite, thus giving the look of having a mouthful of mayonnaise.
Ugh I can't stand that smug mayo smile of hers...it's so fake!!
A dirty deal is when a male or female engages in anal sex without properly cleaning their anuses, thus leaving the person doing the fucking with a shit covered dick or dildo.
I heard he fucked that nasty bitch in the ass and she gave him a dirty deal!!
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