Green’s Dictionary of Slang

geek v.2

[? US teen colloq. geek, a vulgar, low-class youth]

(US) to sell items in the street.

[US]ADS-L 26 Mar. 🌐 A few years ago, I heard the term ‘geeking’ used to mean selling items on the streetcorners, possibly stolen items, possibly for money to buy drugs.