the act of fingering ones anus while simultaneously masturbating. More commonly called "Pokey bum wank"
I walked in on Matt giving himself a bummy tug yesterday... his finger was in shit central!
by Magaz July 24, 2009
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Short shorts. Or really small shorts. Australian?
I love the way my cottage cheese thighs look in these bummies.
by Ellieee November 17, 2007
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When someone is looking ugly/unattractive
"Ughh why do I always be looking bummy on snappp?!"
by Baitedlj December 14, 2017
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When one person puts his penis up against a woman's asshole, but not in it, and then ejaculates--causing the cum to coat the butthole and slide down the rest of the crack.
Oh man, the other day I gave Sheila a total gummy bummy. She had to take a shower after that!
by Cheesesock December 16, 2010
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when a person catches this 1 in 7 billion disease they are no longer able to sing a song or say a quote with out adding the words ‘bum’, ‘bummy’ or any other form of the word ‘bum’.
karen: “thank you, bum, thank you, bum!”

steven: “karen stay away from me! i might catch your bummy disease!”
by big keelungus January 19, 2019
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when one cannot sing any song without including 'bum' or 'bummy' in a sentence they sing. it was made by me and my cousin.
"woaaah, woahh, i need a bum romance." - Keela

"dude, you got bummy disease?"
by immemoriess January 19, 2019
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The sweet based bait a peadophile uses to lure kids into his van
Hey there kids want to see the Bummi Bears I have in the back of my van?
by URBANLSI July 8, 2021
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