flog a dead horse 

UK usage

1) To try to carry on when there really is no hope of continuation. To not know when to give up.

2) A unique sexual practise that combines Necrophillia, beastiality and sadomasacism into one fun activity.

Leeds struggled to avoid relegation but they were flogging a dead horse.

flog a dead horse by black flag June 7, 2004

beat a dead horse

The act of pushing onward when a decision has already been made and will not change.

Tod: I think we should eat tacos every night.
Tim: I think you should shut up because tacos every night is the worst idea ever.
Tod: Tacos. Every. Night.
Sam: Dude, no.

Tod: WE NEED TO EAT TACOS EVERY FRIGGIN' NIGHT, MAN!
Tim: *sigh*
Sam: Way to beat a dead horse...

beat a dead horse by Noodle8 October 29, 2011

Raping a dead horse

The extreme attempt to carry one something that is already resolved or no one cares about. The extreme case up the idiom, "beating a dead horse".

The cocky douche bag was beating a dead horse by rubbing his victory on the loser. However, he preceeded to raping a dead horse by talking trash to the loser for the next 20 years.

Raping a dead horse by whowantsrice February 8, 2010

beating a dead horse 

an act of sexual perversion combining bestiality, necrophilia and sado-mashocism.

A government study was funded to study various sexual perversions: sado-masochism, necrophilia and bestiality. The study was soon halted however ... the researchers decided they were just beating a dead horse.

beating a dead horse by Figleaf23 January 4, 2009

Flogging a Dead Horse 

For a male to persist in virginal intercourse after losing his erection

After only lasting 1 minute Sam was flogging a dead horse to Jenny

Flogging a Dead Horse by Ginger Christ September 3, 2009

beat a dead horse

the beating refers to the overusing of the "dead horse". Said horse is a metaphor for a joke, and the fact that it's no longer living implies that it's no longer funny

person1:hey...is that a dead horse
person2:uhhh.....yyy..yes i believe it is...why do you ask?
person1:oh no reason...say...you wouldn't wanna beat that dead horse would you?
person2:i thought you'd never ask
persons1+2 proceed in beating the dead horse
five minutes later, cop enters
cop:hey are you beating that dead horse?
persons1+2:yes...
cop:...well...care if i join you?
persons1+2:not at all
cop starts shooting horse whilst the tho persons continue to beat it with sticks, fade to black, THE MORE YOU KNOW enters along with someone from Friends talkin' about some stupid crap.THE END...But is that really the end?...Yes, yes it is...Or is it?

beat a dead horse by liamofthe----- April 6, 2004

Blogging A Dead Horse

When a troll continues arguing in a flame war thread that is long dead as both sides have made all of their points and have stopped caring.

Offenders are typically crying for attention, with have low self esteem and attention deficit problems.

Similar to the traditional "flogging a dead horse".

Pseudo-intellectual 1: Well I don't want to say too much on the topic, but: ... (5 paragraphs of opinionated rant).

Pseudo-intellectual 2: I support this, and would like to further add: ... (3 paragraphs of rhetorical questions and half-baked psycho-analysis).

<Thread Dies>

<2 weeks later>

Ring-in: This isn't really my argument but in my opinion both sides are wrong. I don't want to say a lot but... (10 paragraphs of literary quotes, topical allusions and first year philosophy diploma name dropping).

Observer: Doesn't this ring-in know that he's blogging a dead horse?

Blogging A Dead Horse by Ev. I December 1, 2009