Nackname
A tiny, dirty version of a name that comes from the butt-end of someone's name, not the front part, which is way less cool.
My friend's name is Larry, so his nickname is 'Ry' because he's a butt-kissin' little f***er.
Her name is Rebecca, so her nickname is 'Becca' because she's a back-end, messy eater.
His name is Jonathan, so his nickname is 'Ton' because he's a f***in' back-end, lazy slug.