One who dresses up as a ninja by folding a t-shirt about their head in a specific manner. A faux or immitation ninja.(Usualy used by Pirates to spy on Ninja.)
Arg! Ye can hardly tell that yer nothing but a T-shirt ninja! You'll fool them for sure, ya scurvy dog!
by David Burtch May 13, 2006
one hides his ninja identity with a shirt over the head. bad ass mother fuckers.
Dude! That t-shirt ninja totally kicked my ass!
by foad January 09, 2005