Syncrofuck

Verb. sing-kruh-fuhk
The rare case of either twins or clones (or syncrofucks*) having sex with either twins or clones (or syncrofucks). The entire performance and finish must be exactly the same at the exact same time.

*noun - children from the act of syncrofuck.

"Hey did you see those twins at wet willies?"
"Oh, they're not twins, their fathers were identical twins who married identical twins. Then since both mothers and fathers were identical twins they decided to syncrofuck and have identical children."
"No shit?!"
"Just ask them."

Syncrofuck by MishaOdessa January 26, 2010

sickfuck 

a person who's so obsessive and disturbed that there's no other word to describe them, other than sickfuck

Louser is such a sickfuck for all the shit he's done over the years

sickfuck by anonymous1111 September 22, 2008

Sinefuckency 

- Noun {sin-i-fuhk-n-see}

The state or condition of lacking fucks; of not giving a fuck.

{ "Sine-" (L. "without, lack") + "fuck" + "-ency" }

1.
Charles couldn't bring himself to finish his taxation law assignment as he was suffering from an acute case of late-semester sinefuckency

2.
Bloke 1: That bloke couldn't have appeared less interested in doing his job properly if he'd tried!
Bloke 2: Agreed, the sinefuckency was strong with that one!

Sinefuckency by Charlemagne1993 July 9, 2015

ava sincock

a hot girl with a fat ass who loves the 1975

wow did u see ava sincock shes so hot

ava sincock by coooooooooooooolggggaaaaalllll April 29, 2020

sinsafuckinuh 

a word used to convey that it has been awhile since something last happened.
This word was originated at Stiver's Bar in Chelsea, Mi.

'Hey man, I haven't seen you since, uh, fuckin, uh, (sinsafuckinuh) last Tuesday!'

sinsafuckinuh by kt rix August 29, 2007

sickfuck 

a person who thinks and says sick and dirty things, usually about fucking. Therefor someone came up with combining sick and fuck. Thats a smart ass person.

ryan h: I wanna fuck you up the nose
random person: eeww bitch your one sick fuck

thanks to tayler for the inspiration of this defintion

sickfuck by bendazzle August 6, 2004

sickfuck 

Ultimate praise for doing something unordinary or overly extreme or dangerous

Guy does a backflip on dirtbike over 75 gap with no protective equipment.

WHAT A FUCKIN SICKFUCK !!

sickfuck by DanielHM September 22, 2007