When someone sneaks behind you they use titun to scare you before putting their finger in your butt crack. You can also put your own finger in your butt crack.
When my sister sneaked behind me and screamed titun I knew my butt crack was about to be invaded.

I made titun to myself because I was bored.
by Strottengrotten September 24, 2021
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When someone sticks their finger inside your butt they say this.
I put my fingers inside the butt of my boyfriend and screamed "titun!"
by Strottengrotten September 12, 2021
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