look up any word, like sparkle pony:
 
1.
The erection of a woman's nipples due to intense sexual arousal.
Ashley's thin bikini top couldn't hide the titty boner she got when she saw Jeff's buff physique.
by Romeo Foxtrot January 22, 2007
 
2.
Hard Nipples... that's all, just a retard way of saying that.
Do I really need one of these...

"When I slather her body with a stick of margarine she gets titty boners."
by fastcore June 10, 2008