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a final drink before bed
I love having an irish coffee for my night cap
by ploop February 08, 2005
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a drink (usually whisky/whiskey) taken at bedtime to aid a better sleep.
i'm a bit agitated i think i'll have nightcap
by Caleb Worsharski November 26, 2003
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Sex (thinly veiled euphemism for)
"Would you care to come upstairs for a nightcap?"

Translation: "Am I getting laid tonight or not, lady?"
by Alexandra August 16, 2004
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When you ask a girl to come up to your place to finish the night off with some sex
After we went to this bomb ass club on the southside, that bia couldn't deny me when I invited her up for a night cap
by youknow36 March 12, 2006
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traditionally, a drink had after dinner. or right before bed. as opposed to capping off a long night of drinking
We had an aperetif before dinner and a wine at dinner let's have a nightcap while we play cards and then go to bed,
by Anonymous September 08, 2003
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