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Short for Wibbly-Wobbly, Timey-Wimey, Spacey-Wacey.

From Doctor Who.

Used to quickly tell people who aren't geniuses that science is happening and trying to explain it would result in such profound techno-babble as to be incomprehensible.
The Doctor: People assume that time is a strict progression of cause to effect, but *actually* from a non-linear, non-subjective viewpoint - it's more like a big ball of wibbly wobbly... timey-wimey... stuff.

Amy: It's spacey-wacey, isn't it?
The Doctor: Well, actually, it's because the Time Lords discovered that if you take an eleventh-dimensional matrix and fold it into a mechanical... Yes, it's spacey-wacey!
by Bebopbeats June 21, 2011