look up any word, like dirty sanchez:
 
3.
a snake in the grass is a sly person whos always doing things behind peoples backs.
e.g.
-slithery one.
-an eva cowzer: "im a snake in the grass"
by gemmeeg February 07, 2010
 
1.
A shady, conniving person who could strike at anytime without warning. Similar to a gorilla in the mist.
Mary: "I've had enough of your insensitivity! I'm leaving!"
Larry: "Hey, quit blocking the TV!"
Mary: "I'M LEAVING YOU, YOU ASSHOLE!!!"
Larry: "So what? Oh damn, did you see that catch T.O. just made? Un-be-fucking-lievable!"
Mary: "I think I'm going to start seeing Fred, from the office. He's a real gentleman and can fulfill my needs, unlike YOU!"
Larry: "Whatever, bitch. That guy's a real snake in the grass, don't waste your time. It's halftime...get over here and hop on my johnson."
by Nick D March 04, 2005
 
2.
Your girlfriend's "Guy Friend" who never chooses to talk about you with her, comment on pictures of you and her, and never ever makes an effort to meet you. The worst part is, your innocent girlfriend will always deny and defend him because he's seemingly so "nice and friendly" when you call his actions out.

He's the Punk Bitch who secretly loves your girlfriend and will strike at any weak moment in your relationship.
"Man, that guy is a real SNAKE IN THE GRASS... better look out for him"
by Gh0st01 November 17, 2009
 
4.
the term refers to a long rolled out piece of bubble/full melt hash laid inside a joint or blunt. the hash, resembling a thick piece of spaghetti, usually a dark brown or black, is the "snake" in the marijuana "grass"

NOT recommended for novice smokers
W: "hold on a sec. im rolling the hash out. we gotta put the snake in the grass before we light it up"

J: "the snake. oh god. the snake will get you"

W: "the snake always gets you"
by my iq is 55 February 13, 2011
 
5.
A person (normally male but can be female) who waits for a relationship to be over/in trouble before pouncing on one of the pair.
James breaks up with Sophie. Jacob is a snake in the grass

James mate- "dude, i heard Jacob tried it on with Sophie. you broke up with her yesterday, man"

James- "yeah, i know man, he's a complete snake in the grass".
by pinityoufairy December 20, 2010
 
6.
Describtion of some one who waits off to the side watching events unfold and will swoop in and grab any spoils when no one is aware
Eg. a snake in the grass is some one who claims for themselves a beverage or food that you left briefly unattended
by Dicko261182 October 15, 2009
 
7.
(eBay terminology) Someone who watches an auction but doesn't bid until the last minute.
As long as there isn't a snake in the grass, that voodoo doll is mine!
by Reyn October 20, 2005