When your hair is really greasy and oily and on the whole quite disgusting
Person A: Omg look at her hair...it's such a grease bomb!
Person B: Yh I agree
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When you're about to ejaculate, you stuff the tip of your penis onto the buttcheek of your partner's freshly shit, unwiped ass, making the semen spray in all directions over the buttcheek, looking like a poorly made cheesy grease bomb.
My partner shit last night so we decided to do a Cheesy Middle Eastern Grease Bomb before she wiped. It was amazing!