What is finding the seam?

(v) when a woman masturbates by squeezing and releasing her thighs while wearing tight pants.

Girl 1: ....ugh
Girl 2: I saw you checking him out.
Girl 1: no...no...I was just thinking.
Girl 2: Nope...you were total finding the seam right then, weren't you
Girl 1: aah...you caught me...I hope it wasn't too obvious.

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finding the seam - video