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2.
Another way of saying no with "Ooomph". Used when laying it on thick and trying to let someone know you don't want whatever the fuck they are selling.
Guy: wanna play tekken 5 and then make out?
Gurl: hellsno
by B March 31, 2005
 
1.
Hells no is worse then "Hell no." Hence the "s" after Hell.. which implies that that it is multiple Hells making it worse then only a single Hell.
Bro - Go to the Kenny Chesney concert with me
Me - Hells no. Kenny Chesney is a fag.
by SirLeche May 02, 2005