sinc 

A girl who can't keep her promises, she will lie behind your back, she might say things she doesn't mean, and she cannot be trusted fully, but you still love this girl because there's something she has that no one else has... and she's fit.

I dont care if she's a sinc, because i love her

sinc by my word is true June 29, 2011

N*sinc With Guitars 

1) A bad pop-rock band. Often given to corporate sellout bands.
2) Literal meaning; N*sync with guitars.
3) A un-needed blatant attack on pop-rock bands in general by some angsty teenager.

Dude, that band sounds like N*sync with guitars.

N*sinc With Guitars by Bakagamer September 13, 2005

lip sinc

to move your lips to song vocals while not acutally singing them

shania twain

lip sinc by imalive December 10, 2003

N*sinc With Guitars 

1) a broad term covering bands like and not limited to: Good Carlotte, Simple Plan, Greenday, Linkin Park, Yellowcard, Sum 41, Hoobastank, and many other shit bands that sound like Nsinc with guitars in the background.
2)Good Charlotte
3) Bands liked by teeny boppers

Goth Poser #1) LiKe, OMG!!! I jUsT g0t TeH nEw LP cD!!!!
Goth Poser #2) w0w! LiKe BuRn Me A c0pY>> DeN iLL LiKe gIvE u A cOpY of mY GOOD CHARLOTTE cd!!!
Me) *WTF* im guessing you all have tickets to the yellowcard concert then? *caugh*

N*sinc With Guitars by rammstein666 February 24, 2005

Sinceriously 

1. The ability to speak freely, openly and honestly about anything; if you're going to say something, say it sinceriously.

2. To initiate any action while spreading as much good karma as possible.

When I say this I say it sinceriously.

I'm going to sinceriously raise as much money for charity as possible.

Sinceriously by Gingey87 January 17, 2015

Sinco de drinko 

When someone fills up A sink full of alcohol and get's wasted with there friends.

Craig : So are we goin to party hard tonight?
Chad : You bet Sinco de drinko at Kiersten's place!
Craig : Hell yeah we are going to get so fucked up!
Chad : Yeah I can't wait to pound some pussy all her friends are going to be there too!
Craig : Sinco de drinko WHOOOOO!

Sinco de drinko by SlopNChop May 5, 2017

Since 'Nam 

A term used to exaggerate the age of an event or occurance.

"I haven't been to Applebees since 'nam."

"Dude, take that jacket off. No one's worn that style since 'nam."

Since 'Nam by kamikazeeeeeeeeeee April 10, 2009