1 definition by Japanirish21

Top Definition
A type of clip, which holds 10 rounds. The full name of the mag is Taurus PT247 Blue 40 Caliber.
Example from Jadakiss's song Something Else-

You know i like to style on ya, Blue 40-caliber, butterfly doors on the triple black challenger
by Japanirish21 June 21, 2009

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.