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Guys that lonely girls, or often girls with low opinions of themselves (see also; GWLSE) pick up and go out with.

Like a McDonald's take away - it's fast, it's easy, it's cheap, convenient, and it's DIRTY. (And more often than not it's something they end up with after a night of hard drinking).

The McBoyfriends are usually ugly or plain, or have no outstanding features or personality - or sometimes no personality at all. The McBoyfriend is a tool.
'Oh yeah, I saw her last night. She was with her latest McBoyfriend.'
by Dirty Scarlet January 29, 2010
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