a phrase used when telling someone/something to get the hell out and to go away and die.
mark: dude, scott, please play yu-gi-oh cards with me!!! please!!!! there's this awesome new monster that-
scott: mark, go fetch.
evil animals, like little dogs. also can be really annoying children.
suzannah: quit peeing on the couch, spawn!
spawn: bich, ill do whatever i want!*barks*
"damn, that five year old is like, spawn or something!"