Knee bumping

When a guy pretends to accidentally put his knee on your leg just to test to see if a woman is in to him.

Sarah: That guy at the bar kept knee bumping me.

Amanda: He is so testing to see if you will fuck him.

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bumping knees

To be playful. But also can mean you have interests in that girl/boy.

Omg Susie was bumping knees today with Kyle does she like him?