The juicey goodness that runs down the grundle during anal plundering.
"Man I was hittin' Jenny so hard last night in the ass she was drippin' grundle gravy."
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A thick, moist cream cheese like deposit, located primarily in the feminine crotch area- created by flap friction during vigorous exercise in high temp environments or in low temp environments depending on flap mass.
After an extended fast walk session, a large reservoir of Knickerflap Grundle Gravy was evident in the professional lady's yoga pants.