When you hug your boo with your hands on their bum!
A nice tight bum-hug is a great day to start the day!
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When you hug someone from behind. Usually what boys do to girls.
Person One: You look like you could use a bum hug
*Hugs person from behind*
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When you give someone an embracing hug while peeing on them through your clothes.
"George gave his wife a bum hug after a night of heavy drinking"
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