The act of dipping the head of the penis into crystal meth and then having sex straight after.
Gynecologist- "Ma'am, your vaginal walls are covered in lesions. Have you ibserted anything in there recently?"
Woman- "Oh yeah, I asked my boyfriend to give me that sweet sherbet dick dab last night"
Gynecologist- "The, ehr...sherbet dick dab?"
Woman- "Yeah" *shows Urban Dictionary definition*
Gynecologist- "What the fuck"