Lyric discussion by mrmateo 

Imodium is an opioid/opiate which can be used to edge opiate withdrawals. It can't cross the BBB (blood brain barrier) so it doesn't give you the euphoria due to the extra fluoride in its molecular structure.

@mrmateo I'm not sure if you're in the States but here Imodium stops diarrhea by putting a cork in your ass (not literally but it definitely plugs it up somehow)

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