To ram one another. Typically used with reference to two homosexual males, or two homosexual females wearing strap-ons.
Have sex, rail, bone, make love, anally fon
"Let's joist."

"It's about time you asked."
by The Misanthropist March 9, 2015
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to have a good time or to describe something you found enjoyable
“i had a joisty time skipping with christopher last night”

or

“we should get together tomorrow for a joist”

or

“did you see the amount of homework we got, so not joisty”
by the joister October 30, 2020
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A carpenter's term for the accumulation of cobwebs, dust, cockroach carcasses, and other debris that adheres to the sides and edges of floor joists.
"That crawl space was so narrow I had to lie flat on my back and every time I moved I got a face full of joist-smeg."
by Dr. Dummy December 14, 2005
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