wickedy boo Share definition Flag First heard in Elgin, Scotland ( - possibly of Latin origin). Simply meens 'that is cool', accompanied by a hand jesture of a 'w' and a 'b' (in referance to action, event or object) "Wickedy Boo! Man" wickedy boo by Laurie Collingwood / Siobhan Wilson March 21, 2005 Get the wickedy boo mug.