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the same as a weekday except spent jacking off.

Jackday's are spent usually watching porn (or whatever gets you off), regular tv or movies, gaming, chatting, texting or surfing the net. To be considered a full fledge jackday one must not have any direct human contact for more than 1 hour in a 24 hour period.

to have an EPIC jackday you must have at least 8 sessions within the 24 hour period of your jackday.

if you only have 1 session, that is lame, and not considered to be a jackday!
oh dude, i couldn't stop thinking of fucking samantha i needed a total jackday! if it wasn't for my 'rents coming home it woulda been totally EPIC
jackday by jackask September 4, 2012
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jackadandy 

Also spelled "jack-a-dandy".

An old term referring to a "dandy" - an upstanding, fashionable man - that flaunts their class and fashion.
The term "dandy" itself has no negative denotation.
"That guy keeps telling everyone his fashion sense is the best. He's such a jackadandy!"
jackadandy by Robert Walpole June 15, 2017
Cross jacking off with your dad/ your friend’s dad
hey dad, I have already finished my homework, can we jackdad?
jackdad by Alphonso Schwanker March 22, 2021

Jmacdaddy Effect 

An alcoholic drink made by combining Mountain Dew and Malibu
"What happened last night?"
"You had that Jmacdaddy Effect."

mackdaddy 

a really good pimp; a player who is good at "what he does"
all the girls roll with me, i am the mack daddy
mackdaddy by hot stuff June 30, 2004

JackBaldy 

A notorious sexual position. While playing a a computer game the man receives oral sex from a woman while he scores the highest K/D in the match
"Hey Jake, Last night I got a sweet JackBaldy from a girl I picked up at the bar!"
JackBaldy by Cr4zeeyEd33 December 12, 2012

Mackdaddy 

A word ment only for Mackdaddy and Mackdaddy only there must be no Jamisondaddys, jasper daddy's or joshuwashdaddys it is forbidden
Mackdaddy is lit man
Mackdaddy by Scrubs diggity May 22, 2017