When a man spends all night waiting for a girl who should have come to meet for a date hours ago, but she never turns up. Similar to being stood up, but with more existential loneliness than just missing out on action with the ladies.
1: He's spent all night Waiting for Godot-Girl. Poor guy needs some self respect to ditch that biatch.

2: Sandra: Poor John's been Waiting for Godot-Girl, I better call him back and apologise for not showing up.
by TeenAuthor June 19, 2008
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