A bass-like sound, that sounds like any of the following:

* the sound of a pedestrian being hit by a car
* a funky bass-line
* the repetitive sound of a heartbeat

An apparel and gift company in Cambridge, MA, called "Thoomp!" was named after the onomatopoeic "thoomp" sound.
Thoomp!'s company logo (www.thoomp.com) suggests the primary definition listed here.
by Thoomp! August 19, 2009
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a badass word used by people who are too dope for normality
Dude those shoes are thoomp
by rager97 August 2, 2011
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The sound of the action that occurs in the beginning of having sex.
Bro I heard you smashed Hailey .

I had too bro she was so bad, i was all in there just like thoomp!
by Silly diamond March 22, 2017
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To insert something in an anus. Comes from the sound created.
I'm going to ram this in your ass. Thoomp.
by Eric Thomas January 27, 2009
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When u anally abuse yourself as you lay peacefully asleep and give yourself cuts inside your anus and shit blood.
He was so out of it last night he thoomped himself
by Grozmotx July 20, 2019
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