A phrase used generally to replace the name of someone when you have forgotten who you were going to talk about. This is similar to What's his face? or What's her face?, but usually catches the other person off guard.
Guy 1: So what are you doing for Labor Day this year?
Guy 2: Oh you know, I'm going home to play a game of football with what's his nuts, the guy who always ran an extra mile after gym practice.
slip of the tongue perhaps,
Those idiots who drive around in a ridiculously raised pick up truck, making a top heavy vehicle even more top heavy and unstable
A:*gah*
B: "Whats the matter"
A: This dam prickup is blinding me.
B: Stupid thing's, as if there lights weren't blinding enough as it is.