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To perform oral sex. When going down on a guy or a girl it's additionally customary to make the Pac-Man (Or Mrs. Pac-Man) sound of Wakka Wakka Wakka.
"Yo man, Jessica totally went Wakka Wakka Wakka on me last night. I made her wear the bow and everything."

"Last night when I went Wakka Wakka Wakka on Jim he made me actually make the noises and everything."
by El Zacko May 04, 2007
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