When I win, I'll repeatedly 6P2K and 66H+K
Free Step Dodge
KasumiLover
Hazard
I just beat them and put "gg" in the chat to rustle their jimmies.
Chapstick
I either do nothing or do it right back. Or just do some stupid shit like H+K H+K H+K H+K
lotr9690
I just leave. The second I stop having fun is the second I move on to another game. I only allot myself 3 hours a day (21 hours per week) as a maximum so my time gaming is at a premium. Obviously I can never reach 3 cuz I'm not even home 3 hours a day anymore... School, nightlife etc.
KasumiLover
There are times I go overboard, like although I koed the opponent, I accidentally hit them again while they're on the ground or I finish the combo I was on, but only because I didn't process right away that the round was over. I also do Phase's 8K because it doesn't hit and I like the "HAII!" sound she makes.