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Someone whose mind is always preoccupied with any beautiful or sexy properties about the sine curve or function.
Arthur is such a sin-ful fellow, who is always trying to excite any geeky girls with these trig relationships:
a) sin x = x – x³/3! + x⁵/5! – x⁷/7! + ⋯
b) sin 2A + sin 2B + sin 2C = 4 sin A sin B sin C, where A, B, and C are the angles in a triangle.
b) ⌽ = –2 sin 666°—when the number of the beast, phi, and sine are in an eternal triangle.
via giphy
by MathPlus123 October 19, 2017
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doing naughty things, being bad, doing something that society sees as bad or wrong, being evil, not caring, comiting a sin.
example 1:
person 1: Hey did u comit a sin last night?
person 2: Yes, i had a one night stand, if that's what you ment.

example 2:

I didn't listen to my parents. Oh, i'm so sinful.

example 3:
I like that hot ass guy with tattoos! He looks so sinful.
by daymgirl January 06, 2010
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Horny; dealing with all thoughts of sex and its fantastic acts.
"I was so sinful last night that I almost had to change my panties," my friend Jackie would say.
by foxxylady May 14, 2006
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Term used by the spiritual and religious community for 'evil' actions deemed to have a somewhat deserved unforetelling or difficult circumstance. Usually linked to 'fleshly' behavior or desire.
His sinful action caused her to benefit in alimony.
by Zandroid August 18, 2017
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