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3.
A crocodiles Smile is a moment when you accidently have a poo sitting down that maintains its position in-between the crack of your cheeks.
"I cant tell if this is going to be a fart or a poo"
1 minute goes by...
"Why are you looking at me like that?"

Tim maintained eye contact with a hint of a crocodile smile
by HVMachine November 12, 2010
 
1.
Being fake to someone. Acting like you're cool with someone then going and talking shit behind their back. Similar to crocodile tears but more of a "happy" fake.
Person 1: Hey brother! How's it going dude?
Person 2: I ain't your brother. Fuck you and your crocodile smiles.
by DIABOLIC4L June 02, 2007
 
2.
A fake smile, or insincere approval. This smile is given with deception or sarcasm in mind instead of true happiness or good-will.

A sly or sinister smirk. While a real smile conveys warmth, this smile is given to hide evil intent. Popular with politicians, crooks, and phony friends.

Similar to "Crocodile Tears", exaggerated sorrow or fake tears, a crocodile smile is usually given by someone with an ulterior motive.
Although he was blissfully employed, Barry borrowed $500 from his friend Joe and slipped him a "Crocodile Smile".

Joe: So, you need a loan to fix your car?
Barry: Yeah, things are rough.
Joe: What's with the "Crocodile Smile"? Is there something you're not telling me Barry?
Barry: Ugh.
by kingphilip2 February 02, 2012