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1.
\\
Internet lingo to show confusion and/or dumbfoundedness.
(On instant messenger:)
Robert: so how are you?
Marla: you... are a space monkey!
Robert: \\
Marla: oh, nevermind.
by RaymondH March 04, 2009
 
2.
\\
emoticon that represents a flaccid penis while simultaneously indicating disapproval or disappointment of the topic of conversation
Bill: "That girl has herpes."
Sam: "\\"
Bill: "Yeah, but I gave it to her."
Sam: "//"
by harderdrugs July 01, 2011