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Means "my awesomely cool bro".
the perfect acronym to use in your responses on the internet to add a bit of flair in your speech.
npmacb: no problem my awesomely cool bro
tyvmmacb: thank you very much my awesomely cool bro
tymacb: thank you my awesomely cool bro

just a couple examples, but the possibilities are endless.
by SennyChoon January 29, 2011
A type of submachine gun that is favored by many individuals and groups because it is small yet powerful and relatively accurate firearm.
Run like im in a track meet, swift with the mac B -50 cent,"my toy soldier"
by Robert Korsakov November 09, 2005