Utterance of
suprise, generally used when one is hit with something
profound. Often associated with the terminally
stoned, for whom nearly everything seems profound. Maybe it's the sound of
neurons imploding.
Also used when one it suprised by meaningful coincidence. E.g: when one's smart-ass remark winds up accidentally being on-topic and insightful.
Fits with standard definition as in Whoa. (slow down, this freaked my brain.)