look up any word, like cunt:
 
1.
1) to seriously fuck up a situation
2) to suck a given dick
3) to expel air out of the mouth toward an object
1) Liz really blew it when she started using her teeth while blowing it.
2) "Well, I'm on my knees. What should I do now?"
"Blow it!!!"
3) "I actually meant SUCK it, ya dumb bitch (SMACK!)"
by Nick D April 10, 2004
 
2.
To mess up, but not in a big way.
Don't blow it, man! You're so stupid, I know you're going to blow it!
by spenceronehalf January 18, 2004