1.) A sawn off shotgun.
2.) Somone who can insult somone elese very effectivly.
3.) The act of grinding your teeth against your partners genitals while performing oral sex.
1.) Bust a pig wit my saw mouth mossburg.
2.) It's hard to argue with Pauly, he's a saw mouth.
3.) " I was eatin krista, then I gave her the saw mouth, that got her screaming."