thumbing around
It's when someone comes up in front of you and proceeds to give you a hug, but then reaches around and pulls (or rather inserts) a fast one by inserting their thumb into your asshole.
Synonyms for Old fashioned thumb around
On this page, you will find 30 slang terms related to thumbing around. Some of the top words include: smack and grab, log touching, Rimjob, dedigitate, fishhook, and 25 more.