when two or more people jump into each other and bump their chests, as a fiendly bump usually. For females this may be painful.
Nicole and Josh did a chest bump. Nicole was hurt badly though, she had to cry because she squashed her boobs which is painful/.
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When you cum on a girls chest, then she jumps on you and rubs it all over your chest
I just got back from giving my boyfriend a greesy chest bump.
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