When you take stimulant drugs (such as cocaine, adderall, meth) and your dick shrinks down into a tiny useless appendage
Guy 1 : Did you fuck that thot last night?
Guy 2: Nah man I railed some fat lines of blow last night and I got stim dick bad, I couldn’t get it up at all.
When you have taken a drug of the stimulant group e.g. crack, speed, meth, and it's near-impossible to buss a nut - you are given crackhead-like stamina and last forever in bed without ejaculating.