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1.
A stiff nipple.
"look at that girls stiffles!"
"gross, put a bra on, whore!"
by Bette Mild February 19, 2009
 
2.
to hair flip out of insecurity, Justin Bieber style.
On his first date, the boy stiffled constantly.
by 6gradeEnglish November 10, 2010
 
3.
When a women (or man) gets cold and there nipples harden
"Jeez its getting cold in here"
"OMG YOU HAVE STIFFLES"
"Lick them"
ECT....
by Jake-AUS November 09, 2006
 
4.
a male or female with seemingly permanent or everlasting stiff nipples.
lol calm down with those stiffles
by ohcrapnospacebar November 03, 2010