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 7, 2010
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The Greek biblical word for sin, "amartia", means literally "to miss the mark", like an archer. Sin is not necessarily defined by moral wrongness, by transgressing some set of rules, but is instead doing anything that takes our focus off God (the target), onto ourselves, thinking we are the be-all-and-end-all.
"Sin is nothing else than to neglect eternal things, and seek after temporal things" -- St. Augustine
by The Immovable Object January 14, 2004
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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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Guy 1: Where were you?
Guy 2: In the bathroom.
Guy 1: You are going to hell.
Guy 2: Why?
Guy 1: Because that's a sin.
Guy 2: Aw...
by ellometal November 3, 2009
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Seattle-based goth-rock band The Sins emerged in 2000 as "NightMare Boy and The Seven Sins," a post-punk entity inspired by early Brit-pop bands such as Sisters of Mercy and The Mission, U.K. (as well as American rock legends ranging from Danzig to The Doors). Changing their name to simply "The Sins" in 2001, the band has consistently captivated audiences throught the Northwest with dynamic stage presence, vigorous showmanship, and strikingly powerful songs. With members from various backgrounds and disciplines (including a jazz-influenced live drummer and a classically trained violinist), The Sins boldly paved their own musical path, combining the familiar sounds of the British punk past with their own edgy rock influences and ideas.

The Sins have 2 full-lenth albums released on SINister Records, "The Beginning" (2002) and "The Last One Kills" (2005).
by ultima necat March 16, 2006
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literally just @sinfulserpents account on tumblr lol
by itshowdytime September 16, 2019
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