Gut Mustard is the nut that has been saved up for atleast 2 weeks and busted all up inside a vagina and when it creeps out that discolored mustard looking jiz.
Added by KY-Jelly
"I haven't fucked a bitch in about 2 weeks and straight up rawdawged that bitch and filled her up with some gut mustard."
"I skeeted all up in that ho and a shit ton of gut mustard came creepin out."
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