vertical slit

When you are putting your tongue to chick's twat while she sitting on your face.
....

P.S. When she gets off..... and gets off of you and lays down, then it becomes horizontal slit.

Last night I got some vertical slit, it was quite tasty!

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Slit vertically

An insult online, usually used on twitter. Refers to somebody cutting themselves vertically. It has been described to hurt more and be more dangerous than cutting horizontally.

A: "I dislike this kpop idol."
B: "Slit vertically."