1.) The act of wearing tight underwear
2.) The act of getting on your grandma's extremely small toilet
3.) The act of having to press yourself against a cabinet to reach anything high on a shelf
"Boy this new DVB underwear will really smush the bush"
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When someone male or female looks sweaty, hairy, looks like they possibly shit their pants and sat down on that poop while wearing pants.
"Dude that girl is a total smush-bush!"
"That hair guy looks like he shit his pants and sat down! What's the word for that? Oh never mind it's a smush-bush!"