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8.
Not just to die, but to die hard. Over-die. Die and then some. Beating a dead horse. To "Die Hard" implies one does not simply fall over, one is killed in a graphic and action-packed way. Most prominently featured in the Die Hard film series. Generally involves, but doesn't necessitate, being shot.
Dude....you just shot him out a window 30 stories up...
Yeah, I did. Yippie ki-yay motherfucker.
I guess that's how you die hard.
Yep. You're next.
Shit...
by Alan Gruber Rickman October 16, 2010
 
9.
A person who might persist with a certain course of action or belief way longer than most people would decide it was sensible to quit/move on.
"yippeee kiyay motherfucker!"
"He's a diehard FFVII fanboy. Even in the face of all of the evidence he cannot let go."
"Yo. I know it's winter. the waves like make a major tube...."
by Container October 07, 2003
 
10.
Gung-ho, fanatical til the end.
a diehard fan
by HardCore Gamer October 03, 2003
 
11.
Someone who is willing to stick it out until the end.
Someone who will support something when everyone else moves on.
John: Man, that new Hatebreed song is fuckin kick ass!
Matt: Which song?
John: As Diehard As They Come!
Matt: Oh, yeah, that songs fuckin amazing!
John: True, you going to their next concert?
Matt: Yeah, you?
John: Yeah, see you in the pit!
Matt: Will do, brother!

"Never Waiver, Never Falter - REMAIN DIEHARD"
by boo-boo-on-your-little-finger October 26, 2008
 
12.
a person utterly obsessed with someone or something
by Twilight Die-hard February 10, 2012
 
13.
A bad ass clothing company centered in San Diego, CA dedicated to fan appreciation for San Diego sports teams and to the love of San Diego. Founded by owner and designer, Alejandro Gaytan, merchandise is shipped all over the US to San Diego fans that share a love of San Diego and it's sports teams.
Where did you get that awesome Chargers hoodie? From DIEHARD clothing, baby!
by sarasmile83 May 27, 2013
 
14.
Someone who peels out.
Look at all the diehards operating the trim presses over there.
by bob December 14, 2003