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1.
(n) a mentally disturbed, insane, or attention-seaking person that does or says revolting, disgusting, or bizarre things.
OR
a person who says or does twisted or gross things (but is not necessarily insane)

The origin of this slang word is unknown, but it probably comes from the fact that puppies eat their own vomit and feces, especially when sick.
Wow, here Nathan goes talking about fecal matter and anal sex again. He's one sick puppy.
by Bitch-slappin' mofos since 1989 November 24, 2005
 
2.
An australian rock/alternative band originating in sydney consisting of shimon moore (who looks like a vampire and no i dont mean eddie cullen) who does vocals and i think some kind of guitar maybe; emma anzai (who has the sweetest socks ever) who plays fantastic bass and does backup vocals; and mark goodwin who plays drums. he also likes papa roach, cos i saw him wearing a papa roach t shirt.

sick puppies havent had much success in their own country, for some strange reason but apparently UK and the US have them cruising around the charts.

some of their best songs include too many words, howard's tale, deliverance and killing me for christmas. but all of their songs are good.
e.g. sick puppies may have a weird name, but their music is unreal
by em is me January 22, 2009
 
3.
A degenerate lowlife.
A worthless piece of scum that has no boundaries when it comes to seeking pleasure.
A slimebag that is on a mission to reach new lows with every perverted act.
A dirtball who will abuse himself, his family and neighborhood pets to get a thrill.
As a child will display all the traits of a future serial killer.
That sick puppy kid from down the street dumped our trash can all over the yard! Looks like he got your used tampons again.
by jsd96321 February 13, 2012
 
4.
A guy that likes to give it to his missus 3 ways while being spanked with a piece of barbed wire, and can only perform while watching his two jack russels go at it at the foot of the bed.
Man that dude is one real sickpuppy.
by sickpuppy02 February 18, 2011
 
5.
One that is never happy even if it is a success.
One that cusses alot.
Ya know guy, we could've done alot better than that. We should have never lost one game on defense.

Watch Out! He's Pulling A "Sickpuppy"!
by E_Sheets April 03, 2007
 
6.
A guy who is willing to have a very ugly girl as her fubu
That guy is a sick puppy for having Goldie as his fubu.
by thebombest July 10, 2008
 
7.
a male/ female who has a ridiculously public crush on someone and follows them around like a sick puppy, or becomes their personal fan club.
he is SUUUCH a sick puppy for her. he would worship her toilet is he got the chance.
by siiiiiiiiiiiiick puppy May 15, 2006