rectilinear

Pertaining to the measurement of one's asshole.
After a vigorous session of anal sex, Bob's anus had expanded to 3 rectilinear inches.
by C.S. Lewis Jr. September 04, 2004
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Rectilinear distance

The gayest distance between any two points on a grid.
Josh: Hey what's the rectilinear distance from here to Taco Bell?
Andy: Shut up, fag.
by superjoe30 September 25, 2009
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Rectilinear Motion

The formal mathematical term for anal sex.
John gave his student a hard rectilinear motion assessment.
by bakeshop February 16, 2010
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