Best definition
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.

The yaka-wow is strong in you.

Being able to simultaneously apply two socks is very yaka-wow.