look up any word, like sapiosexual:
1. A massive gun that is eleven times bigger than a 9mm, owned only by pure gansters.
1. Whoa, diggity dawg! Did you see Ashley strut by with her 99 mm?

2. Oh noez, Kyle just got shot by a 99 mm!
by ashleyhasa99mm January 03, 2008
1 4