When a female drops her vagina on a man -or- woman's face, typically in an aggressive manner.
Damn! Did she clam bomb you?
I got clam bombed last night, and she hasn't showered in two days!
A clam bomb is when a woman queefs in your face on accident or on purpose.
Clam bomb: I was tattooing Krystal's hip, and she dropped the clam bomb.