I'm holdin two pistols
In the form of a cross yeah I am armed to the T

from Joe Budden (Ft. Crooked I, Joell Ortiz & Royce Da 5'9") – We Outta Here Lyrics on Rap Genius

Meaning

Holding two pistols in the form a cross would look like a lowercase t

This is a shortened version of the original prase “Armed to the teeth"
It is a pirate phrase originating in Port Royal Jamaica in the 1600’s. Having only single shot black powder weapons and cutlesses, they would carry many of these weapons at once to keep up the fight. In addition they carried a knife in their teeth for maximum arms capability.

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