Green’s Dictionary of Slang

1. to masturbate [the arm/hand ‘chugs’ up and down].

1998		I. Welsh Filth 97: The funny feeling in my troosers tells me that a chugging session with Hector the Farmer’s material is well due.
2012		(con. 1980s) I. Welsh Skagboys 125: He’s recollecting the time he caught me chugging Wee Davie off.
2015		I. Welsh Decent Ride 380: She’s chuggin away, n ah’m half ootside the blinds, keepin shoatie.

2. (US campus) to throw away [var. on SE chuck].

1999

Eble Campus Sl. Nov.