Top Definition
the time period between 12 midnight and 1:30 am
I stayed up all night watching numerphile. I went to bed at 2.
by bloooo December 09, 2014
1 more definition
All night means that something is truly amazing or awesome; highly favored.
"Yo, did you see that game last night?"

"Yeah, I mess with the Lakers all day but the Heat is all night, fam."
by ncswag March 25, 2014

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