brainslip

what happens when you're trying to think about something, but you're brain either
a) just won't engage, or

b) does engage, but won't provide any traction for your thoughts

Steve - Hey Bob, what's the ... uhhh ...
Bob - Out with it dude.
Steve - Dunno man. Total brainslip.

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Joanne - Hey Suzie, how's your term paper coming along?
Suzie - Its not. I can sit for hours and think about it, but I just get total brainslip
Joanne - Haha ... just like the clutch in your old Datsun used to slip after you ground the gears out learning to drive.
Suzie - (moans) Oh, its worse than that!!