1. (British) to fart. A children's term of the 1950s which was revived in the 1980s.

'We were right in the middle of the restau- rant and Kitty blew off in front of them all.' (Recorded, father, London, 1986)

2. (American) to reject, get rid of someone or something. A less common variant of blow out.

3. (American) to absent oneself, avoid, waste time. The verb, popular in campus usage, can be employed transitively or intransitively.

We decided to blow off the class and hit the beach.

Don't go to the office today; blow off instead.