Noun.
An impressive, nerdy, and often useless mental or physical ability.
Adjective.
A term used to describe something that is nerdy and cool at the same
time.
It is the accidental brainchild of Baroness
Susan Greenfieldidiot, who, on one of her regular rants warning about the dangers of the
internet on the brain, said that modern technology would result in a generation of
people obsessed with 'yuck and wow'; this was mis-transcribed, and subsequently printed as 'yaka-wow'.
Its dual use as a noun or an adjective is similar to that of the irish word craic. It is also extremely phonologically pleasing as a phrase.