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3.
Fake 'sick days' that people take off work that are actually called 'hate days'
i.e. employees that hate their job/company so much that they fake sick days
Example of a post hate day convo in the morning...

Employee 1: yo dude, you've been off for ages...where you been?

Employee 2: well you know, i had a few HATE days comin....i got most of the rage out of me now i think...

Employee 1: yeah i think i've got a few comin my way too....i'm overdue a coupla HATE days...

Manager : Hey! employees 1 & 2, i've clocked you coming in exactly 2.3 seconds late through the door - how are you going to make up that time?

Employee 2: Damn i feel another few HATE days comin on.....i might have to take a half a HATE day today yo...

Employee 1: i'm with you on that one....
by lady lynxx March 25, 2009
 
1.
The anti-valentines day. Happens every 14th of February. It is a time when groups of people come together to take the piss outta the hallmark day.

This year, 2006, Hate Day organizers have made up posters which mock Bob Geldof & Co.'s "Make Poverty History" slogan and ad styles.

The posters can bee seen in Temple Bar in Dublin City, Ireland.
Hate Day: Make Valentines History
by Andrew Carton February 08, 2006
 
2.
February 15, the day you learn almost everybody else but you got laid the day before. The day after Valentine's Day, that day you worked till 11 pm then got back home to get drunk because you didn't have a date.

February 15 is the day of misanthropy, "Hate Day", when it is mandatory to give away hatred to all of your friends, especially those who got laid the day before.

On that day, you drunk dial your ex, you troll on message boards, you post hate on Twitter, you randomly flip the bird at strangers and take 2 aspirins every 4 hours to relieve your headache.
You: So, how was your Valentine's day. Mine was horrible.

Friend: Well I wished I had been with someone else, but anyway we partied heavily.

You: What did you do?

Friend: I dropped more pills in one night than in 2 years before. Also, two pipes.

You: By "pipe", I assume you mean the object, like a bong?

Friend: No, I mean "blowjob", the act of having a girl putting her mouth around my penis.

You: FFFFFFFFFFUUUUUUUUUUU-

You: I HATE YOU !

Friend: Why?

You: It's February 15, Hate Day.
by Electric Sheep February 15, 2009