Originally, this was a dismissive nuclear reply to someone, suggesting that they leave you alone. Mainstream use has shortened the phrase from “Go
lick Jim’s
asshole; he likes that” to simply Go lick Jim’s
asshole (GLJA) and expanded the meaning to include variations of non-compliance or disbelief - no way, dafuq, pound sand, kick rocks, GTFO, STFU, etc.
While arguing with my
sister, I asked if she wanted BK. She told me to go lick Jim’s
asshole.
Bro, I just won the Powerball.
Dude, go lick Jim’s
asshole. You’re a fkn liar.