prop a leg

Used when referring to a relationship, to describe a lack of any commitment to the relationship. It is meant to conjure an image of one using one's partner as mostly something to prop a leg up on in bed.

"Dude! You and Sandy getting serious? When's the wedding?"
"Nah, it ain't like that. Just needed to prop a leg."

cymballs

CymBalls (plural) are a homemade alternative to felt washers and wing nuts on a drum kit. Basically a rubber ball with a hole drilled through it.

The drummer switched from felts to CymBalls, now his cymbals sound different.

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