"Who you callin' a dirtbag...oh wait...that's my name. DON'T WEAR IT OUT!'"
Dirtbag is an original Teenage Mutant Ninja Turtle action figure from 1991. I don't know anything else about him, except that he originally came with a backpack and a pick-axe and a gun and maybe another accessory or two. I might have the pick-axe but don't have the rest, I don't think.
Dirtbag himself is a fun looking character. He has all the usual little sculpt details the old TMNT line had in spades, like a 'Mom' tattoo, a band-aid on his finger and even teeth marks on his arm (and they're not from some stupid kid who chewed on their toys, either!)