Definitions by ashleyhasa99mm

99 mm 

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!

99 mm by ashleyhasa99mm January 12, 2008