Maybe they are just trying to make someone laugh..We all have some goofy moments..It if it hurts then tell them..I have heard a lot worse then that growing up with older people..Most of them are gone now and I am there age...
Age related joke, as others have mentioned. Taking a "hit" would likely mean of the shot (liquid). Metamucil is a powdered fiber put into juice or water, made to keep constipation at bay. It's historically known as an "old person" thing, hence the remarks at someone's 50th b-day party.
Is there some reason you would suspect a drug-related remark?
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