An acronym for 'shit you not'.
A way to show that you ain't joking around and that you mean business.
Person 1: I got a shitload of homework
Person 2: haha, you're such a bullshitter
Person 3: syn man
by yooooobuoyyyyy September 6, 2015
Originally a packet used in TCP/IP to establish a connection, it is now commonly used as an "Are you there?" request to another user on a talker. It is also used in the less common form "SYN SYN ENQ" - two SYNchronization bytes, then an ENQuiry. The latter form is pretty much the same as the former.
<luser1> luser2: syn
<luser2> luser1: ack
by joshua_ January 9, 2004
Syn is a RMIT based radio show that broadcasts through out melbourne, Australia.
Syn has a small office in RMIT. I heard that there are rats in the RMIT basement and in the tivoli building, better get the mouse traps and poison out.
by RMITstudent September 27, 2005
Acronym of the phrase 'Suck Your Nan'. Popularized by the United Kingdom underground. Mainly used in text messages or instant messaging.
Rich: Your a dick mate.
James: SYN
James: SYN
James: SYN
James: SYN
by OhizzleSYN October 3, 2010
Jonah: *eating leaves* "Hey Michael, you're stupid!"
Michael: "Go SYN!"
by Your Granny Tranny xoxo August 6, 2020
Syn is a powerful and potent alcoholic drink invented by rapper Krazie Bone of Bone Thugs-n-Harmony. It consists of Hennessy and Gin mixed together.
"Gimmie some Henn! Gimmie some Gin!
Naw just gimmie both an' I'll mix it all in!
Who wanna take a lil' sip a dis Syn?
Let me getchu twisted main"

-From song "I Don't Give a F***" by Lil' Jon and the East Side Boys (featuring Mystkal & Krazie Bone)

(Also check out song "Getchu Twisted" by Krayzie Bone)
by evrgood July 10, 2006
Chris: Wait a minute, is that "straight" guy looking to hook up with another guy?

Charles: What a Syn!
by SafeHouse July 18, 2010