Guy 1: Ayo ma nigga, you heard yung rome's new album?
Guy 2: Yeah, don't one of the songs go: suck a nigga dick for the road, young rome!
Guy 1: Yeah nigga.
The other definitions are correct, in that this means the man gets on all fours and tucks it between his legs so the other person can suck it. Important to note though, this position puts the sucker’s nose DIRECTLY in your ass so it is usually used dismissively.
“Oh they said that you should clean the kitchen better”
“Eh… they can suck my dick from the back”