A dirty Katja is when the female starts to talk about astrology or her feelings during heavy sexual intercourse.
"Man, she really pulled a Dirty Katja on me last night!"
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The complex mechanism that is enacted during sexual intercourse where the top is in reverse cowgirl and sticks a finger in the bottoms ass.
Guy 1: How was your date last night?
Guy 2: Bro she pulled the dirty Katja on me... I think she's my soul mate.