short for tactical wank. you tell your friends/coworkers you are going to have dinner or the toilet when in reality you go for a wank.
person1: hey guys just going to get food be back in a few minutes
person2: don't be going and doing a tacky wacky we got work to do
To change name or identity as fast as possible in the span of a year.
Hey, how do you live immortaly without looking suspicious? Easy, just perform a Wacky Yes