
I've been asked this more than once, and YourTango thinks they have the answer: 
What does a male orgasm feel like?  I think they've got it mostly right, although the words they use are a bit much.  Mine start out kinda like "
uhhhmmmmm" and then go towards "
huhhuhhuhhuh", and finally end up with "
WUGGGGNNNNNMMMM!".  If too many of those steps get skipped, it's just "
uhhMMMNoh, sorry..."