The sqraunched up little kleenex tissues you find in the garbage by the computer used to wipe away any ejaculate that was expelled as a result of wacking off to porn or any online erotica.
Regular cotton balls dipped in melted chocolate, then allowed to solidify. Then you serve them to guests. You don't know that you're eating something so nasty till it's too late.
Rusty's mother was throwing a party to celebrate her husband's death, so he decided to submit some chocolate cotton balls as his own contribution to the family candy.