That glob is viscousy sperm that oozes out of her pussy and sticks to her panty gusset. A warm oyster usually makes its unexpected appearance several hours after sex and at the most inopportune time.
I was sitting in my job interview today and had a warm oyster. I think the recruiter thought I was shitting my pants cause I was squirming.

My panties are so wet from the warm oyster that just leaked out of me.
by Eaton Holgoode June 5, 2018
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