Can also be used for any body excretion:
air snyrt = fart
front snyrt = pee
mouth snyrt = puke
mouth air snyrt = burp
liquid snyrt = diarrhea
front pleasure snyrt = splooge
Kyle: Did you just air snyrt? It smells like something died in here.
Rob: Yeah, the broccoli I ate last night is giving me the worst air snyrts.