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1.
To be the raw-est mutha fucka around.

To be so legit people drool when they see you.
"That kids so steggy, he's got bitches for days"
by The master debater November 21, 2013
 
2.
An erection; see: boner, woody, hard-on, stiffy, pitching a tent
"Man, I've got such a raging steggy right now I think it might rip through my jeans"
by Jurassic JoJo October 15, 2012