buttyninja 

1. Sandwich flavoured ninja.

2. A person who works in a fast food restaraunt, specialising in sandwiches.

3.A fat martial artist, so fat that they cannot move.

1. "This ninja sure tastes sandwichey"

2. " he was so fast, he was a buttyninja...the king of butties"

3. "yo brah, you so fat you a buttyninja, want another cream cake?"

buttyninja by Guns don't kill people July 23, 2010

Buttinjaflies 

That sudden, unexpected and mostly inexplicable onset of butterflies in the tummy. From "ninja butterflies" (or "butterfly ninjas").

I was feeling okay but I've just had an attack of buttinjaflies!

Buttinjaflies by SteveLaw July 7, 2011

Buttninja 

Asian buttpirates

AGH! The buttninja are attacking! COVER YOUR ASS!

Buttninja by Brian Blake December 10, 2003

buttninja 

one who is a sneaky a-hole & hard to spot before it's too late, yet considerably annoying on every level that no one wants to be around...usually due to them just being an idiot & not being able to help their own stupidity..

"That guy who showed up at the last minute to go out with the rest of us is such a buttninja!...we HAVE to ditch him!!

buttninja by NomadJr November 5, 2010