blow yourself

The act of putting you own oral orphice on your own genitals and sucking Passionately.

Man 1: you sir can go blow yourself
Man 2: hmmm thats quite interesting. I might have to try putting my oral orphice on my own genitals, the wife never does.

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blow yourself up

To release a particularly nasty,smelly fart. Usually happens after eating Mexican food or something similar (e.g. Taco Bell).

Johnny watched his friend Ben wolf down five bean burritos. Johnny told Ben "you know you're going to blow yourself up in a few minutes."