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1.
The act of spending an unnecessarily long amount of time preparing for a later event in which one wishes to look nice, for example, a party, pub crawl, or a trip of New Orleans during Spring Break. You then find that you've spent so much time making yourself up, it is too late or pointless to attend said event.

e.g. Behavior typical of girls.
Aaron: "You's in New Orleans?"
Michael: "Nah, the girls took too long gussin'."
by T. Riggles March 15, 2008

Words related to Gussin'

girls high heels kisses makeup preparedness
 
2.
To be going fast.
It was like fifty dudes about to whip my man's ass and homeboy was gussin down the ave.
by shan-da-man July 01, 2003