a male who is very good with the ladies, a womaniser, some one who is seen as a 'man slag'. Even though he is seen as this he is able to 'pull' girls. Usually are very good at fornicating.
'hey bekki, did you hear about tom hes a real cocksy, i really want to get with him, hes meant to be amazing in bed'
by vipersno9 February 1, 2008
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Using the same idea as a Selfie but not a picture of your face, a picture of your own penis in it's full entirety with pride and glory.

Typically, taking a picture of your own penis and posting it online, that's a Cocksie. Perhaps for Charitable causes or just for fun to share with your friends!
Why does my willy look small in a Cocksie?

John, can do me a favor and take my Cocksie.
(Facebook post): Here's my Cocksie for Cancer Awareness
Best thing not to do after a first date mate, is send her a Cocksie!
by londonboi April 17, 2014
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