The feeling of regret after you've just shot your load. Normally happens after you've had two hour wank session over some really, really filthy anal dressed up like a pig A2M porn that turns your stomach and makes you fire 2 metres.
Results in you running ccleaner to clear your tracks, the deletion of your five year porn stash and a cold shower.
Tim: I just burnt my clothes, chucked the PC out of the window and chopped my own balls off.
Ben: Bad case wanker's regret man.