The sexual act of swallowing jism after 69ing and or mouth to anus.
That dirty bitch did a gravy chaser after licking my ass!
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Although this can mean what you think it means, it can also refer to the consumption of discolored semen which occurs because of an infection. Both the discoloration and consistency of the semen form the gravy half of the phrase.
After all that kinky shit, I couldn't help but give my wife a gravy chaser.