The exact opposite of the dreaded cockblock. This is when your buddy seriously does you a solid towards gettin' some.
This is not to be confused with the general duties of a good wingman. This is when your buddy has earned himself a freakin' Purple Heart of Wingmanship by showing extraordinary bravery in helping you score.
Sitting on the grenade (ie taking the ugly one home) in its most extreme cases (like, a 500 pounder) qualifies as a cockpush
-Hey man, so I'm gonna take Heather home so Leanne is all yours. Also, I managed to score you a 5 star suite upstairs with all inclusive room service. Happy trails!
-Dude...*chokes up* thank you for the epic cockpush