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1.
Nickname derived from the name Stephanie. Was formed modeling the way fob people said her name. Stiff-anie. Hence the name Stiffi was born. She is the coolest person you'll ever meet.

Many derisions followed:
stiffles
stiffneck
stiff
sitffler
and boner.
idiot: what kind of name is stiffi?
cool guy: a name for a sexy person.
idiot: how does that work?
cool guy: her real name is steph and she's hella sexy
by ridiculousteph May 29, 2008
 
2.
Stiffi(s), a strange extraction from the name Stephanie, tend to be very athletic, good looking and have a passion for their beliefs. Usually engaged to a michelle, stiffi's are very lucky humans. Despite their name, they do NOT have sexual tendencies. Likes making rumballs and breaks in her spare time. She rather likes explaining linear equations to a certain "pimp".
boy one: Is that who i think it is?
boy two: It couldn't be! How could we be blessed with such an honour?
boy one: i think it is..
boy two: IT'S STIFFI!
by an untouchable PIMP September 10, 2006