A man or women who are right handed but masturbate with their left hand watching pron on the Internet because the right hand is clicking on the mouse. Usually refers to someone who is somewhat homely.
Dude look at him, he's not getting laid anytime soon, he's definitely a leftander.
Found this great site, pull a leftander all night!
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A prank name. Sounds like I need a left hander. Comes from the idea that left handed boys are cuter than right handed boys.
Anita Leftander here