A sexual partner that just keeps coming back no matter how many times you throw them away.
See also friends with benefits and booty call
Pete: "Last night Haki came over to my room for some pillow talk..."
Rico: "Again?"
Pete: "I know! I thought I got rid of her last time when I slept with her best friend!"
Rico: "Looks like you got a boomerbang on your hands."
Pete: "I'm not complaining."
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Two or more boomers (old people) having sex.
You see those boomers?
I think they're gonna boomerbang