The act of wrapping your legs around the top of a bathroom stall and taking a shit. When the shit falls out of your ass and into the toilet it makes an "Atomic Smash"
I'd hate to be the janitor cause I just did an atomic smash in there.
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Doing the impossible;triumph;conquer
Derek: "How did you manage to pull that all-nigher and get an A on that paper?"
Colin: "You know me. Smashing atoms."
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An Atomic Smash is a sexual act where one participant recieves anal one hour after having Taco Bell.
"Hey Aspen, had you heard about how Charlotte gave me an Atomic Smash?"