an excuse or a hint to get a girl in the apartment for some physical action, usually after the night cap you have breakfast a few hours later.
by May October 12, 2003
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A man's last chance to get a woman drunk before the date is over.
She was still not too interested in me, so I decided to try the nightcap trick.
by Dan Perry September 15, 2003
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1) a late night smoke session, specifically with the intentions of going to bed immediately following said session.

2) smoking before you go to bed, to aid with sleeping. (potheads swear by it)

can be a personal smoke, (to your face) or a social smoke with some friends.
"Yea man, I'm gonna save half this L for a nightcap."

"I'm goin to bed soon, but I got that goooood, you should stop by for a quick nightcap."
by 5urething February 4, 2010
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a male act of ejaculating in ones hand, followed by slapping the semen onto the top of the cranium, onto oneself or another.
After her boyfriend withdrew from her vagina in the doggy-style position, the woman's hair was soaking wet after being slapped with a nightcap from behind.

After masturbating into his hand, his hair glistened from a self inflicted nightcap.
by Soy Brownie October 25, 2006
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An act of a sexual nature usually performed after a steller date, involving the male punching the female in the face and proceding to deficate in her face just as she regains consciousness.
i gave her the wettest nightcap ever!
by Max February 22, 2005
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When at the end of a night out drinking you offer a goodnight hug to a female friend and attempt to slip a finger in her anus.
I gave Jenny a sweet "Furness-Nightcap" before she went home last night!
by Mr_Toasty February 10, 2011
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A chinese girl gives you a BJ with hot peppers in her mouth
My jizz felt like LAVA From that szechuan nightcap!
by the_creator2323 August 8, 2012
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