Idiom: "be hoist with one's own petard" means?

[Casiopea]

There's one more:

E. A term used by pirates to mean, stubborness.

For extra bonus points, can you name the person who coined the phrase?

 

[RonBee]

I don't know if he coined the phrase, but it is from Shakespeare (Hamlet, I think), and a petard (pronounced pe-tar) is an explosive device.

 

[MW]

Convicted by your own statements or actions.

Shoot yourself in the foot.