The act of receiving oral sex while watching pornography.
Stacy wasn't ready for their date to be over, so she accepted Eric's offer of a San Fernando nightcap.
by arh_ October 4, 2011
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The mini bottle (50 ml) of Jagermeister, stored inside one's pillowcase for when you wake up in the middle of the night and need an extra drink to get back to sleep.
I woke up for a midnight shit and couldn't fall back asleep, so I fished in my pillowcase until I found the Jager, downing the tiny bottle for a little Hawaiian Nightcap.
by Robert Chunks January 10, 2018
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Its origin dating back somewhere in 16th century Russia when compost toilets preceded working plumbing systems; a Ribalkin Nightcap is when a Russian servant would, when hiding from his superiors, be getting a blowjob from a female servant while taking a shit above an unkept compost toilet. While being on the receiving end of said blowjob he would simultaneously drop a steamy deuce, and blow his peasant load to kingdom cum. Directly after going kaboom above the toilet x2 and due to such an incredibly strenuous day to day workload, he would immediately fall asleep on the toilet, empty of his sins.

(This nightcap ritual would usually take place in the evening after a hard days work)
Did you cap off the night with a Ribalkin Nightcap?

Is she worthy of a (Ribalkin) Nightcap?
by Donnie Quadzzz December 13, 2020
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the moment in time before a man or woman is going to bed and has the impulse to send naked pictures to their significant other, to cap off the night
"Bro, I was studying for my test and I checked my Snapchat and realized I missed Anna's nightcap, I really wish I could've seen her naked"
by LowerBody March 9, 2018
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an underground producer who likes hook bk and most importantly rico

and whos into 2077 shit just like bk
my friend nightcap was just simping for hook a minute ago and he even said she has a fat ass
by hwxxd1e October 8, 2022
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The act of using a recreational substance such as Marijuana or another CBD/hemp derivative to conclude ones nightly routine before bed.

Alcohol may also be considered a Nightcap as alcohol is generally known to relax muscles and "soothe" the mind, in small doses.

Ex.
• "Man something smells loud, who's got the grass?"
"That's just Aiden, He's putting on a Nightcap"

• "Eve, is something burning?"
"Shitonacandlestick! Lilith must have burned another hole in the carpet after putting on her Nightcap."

• "Please keep quiet, your father is very tired from work. He put on his Nightcap and went straight-to-sleep."
by YaBoiXero June 11, 2023
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Nightcaping is a proces of bullying all of asian players out of warden and complaining that not everyone lives in NA time zones
warden no.1 - Wow we lost some ground over night

average HOC member- I know right fucking nightcaping
warden no.1 - but they live in another time zone
warden no.1 was reported&banned
by Polak_Gejming July 10, 2021
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