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.