1. A surprising gay comment.
2. Victory, (used as "raping").
3. A seemingly straight gay coming out.
4. Prison abuse.
1. A: I just wanna see what it looks like!
B: Woah, anal flank
2. We just anal flank
3. A: Did you hear about Bryan?
B: Ya, I feel totally anal flank
4. ...a reason not to drop the soap: anal flank
To flank someone (generally in war games) to get behind them, kill them, then proceed to rape them. Usually in some sort of "crouch-stand" maneuver. (Tea bagging
Soldier 1: Dude, we got to anal flank these guys, we're getting owned!
Soldier 2: Alright, I'll distract them, you do it.