To have triumphed in a battle that was reduced to matter of testicular fortitude. To produce a bollock of greater volume when confronted with an adversary of supposed superior masculinity.
While it is mainly used to describe events occurring in a sporting field of play, it would not be out of place when describing events in a theatre of war, a dance off or a game of scrabble.
Gambler 1: did you hear about Rafael Nadal yesterday?
Gambler 2: huh!? no i didnt man, what happened?
Gambler 1: Croat dude named Ivan Dodig beat him in 3 at Montreal Masters.
Gambler 2: hahahah bull**** man you're taking the mick
Gambler 1: no joke bro, Nadal was up 5-3 serving in the 3rd set, but nadal didn't choke... Dodig totally outbollocksed him.
good day of work Jerry, I'm Outbound, I'll see you tomorrow.
Screw this lame party, I'm Outbound.
How the hell did you guys drag me all the way out to violent ass Oakland? I'm outbound