Has four possible meanings.
1.) Getting hurt/hurting something
2.) Destroying/breaking something
3.) Messing something up
4.) Used as an onomatopoeia (describing word)
1.) This dude threw a baseball at me and my arm got kerchunked
2.) I was at my grandparents house and I kerchunked their favorite vase
3.) "I totally kerchunked that test, man."
4.) When I broke my knee, it made a "kerchunk" sound
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