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1.
The congealed, dry snot-like substance that forms as a consequence of rubbing dried or drying jizz off of one's skin. Jizz boogers are most commonly formed during a second round of sex after finishing inside a vagina or rectum. The action of continued thrusting and withdrawing of one's cock inside of such a jizz-filled orifice will cause the jizz to dry and coagulate into boogers around the area of intercourse. Jizz boogers may also occur after letting jizz dry on one's skin and subsequently trying to rub it off. Not to be confused with smegma.
Guy 1: "So we started having sex again after I finished inside her, and after 20 minutes she was all dry and I had jizz boogers all over my cock"

Guy 2: "Dude, thats gross, you should definitely use some lube next time"
by Chef the Botchmaster May 05, 2011