Man grasps the base of his erection, squeezing, causing the tip of his penis to resemble a mushroom.
While watching the Oprah Winfrey show, i had a hankerin' for a Shroom Boom
by Koonjam and TheBigSmooth December 8, 2009
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A nuclear explosion or an atomic bomb, which makes a mushroom shaped cloud.
"I saw a documentary about shroom booms on the History channel the other day."
by Orly Wild August 26, 2008
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(See Shroom Boom)

When a Shroom Boom goes wrong resulting in the "Shroom" to bleed and cum.
While Shroom Booming to Oprah, a Shroom Boom Kaboom shortly followed...
by Koonjam and TheBigSmooth December 8, 2009
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