The cup one keeps on their nightstand or by their bed in case of urinary emergency.
My sister stayed at my place last weekend. She thought she was drinking the last of the apple juice but got my alarm cup instead.

Tony was such a dick last night at the bar. But he left his alarm cup full from the night before so I woke him up for brunch with a vengeance.
by Doctor Exotic August 12, 2011

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