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It's the sound when pacman is moving through his video game levels.
Someone follows you without a reason and hes always saying:"wacka wacka wacka wacka wacka" like pacman.
by Klattowsky und Treisenov May 21, 2008
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expression used to refer to a sexual act, especially when you want to be ambiguous. it can refer to anything that is more than getting your slide on up until, and including, having sexual intercourse.
"What happened after the party last night between you and that one biotch?" "you know...wacka wacka."

We were getting our slide on in outside of her apartment, and then we went to her room for some wacka wacka.
by rizosh July 15, 2001
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