One of the unholy trinity of internet pictures which all must witness to be 'jaded internet users' (tubgirl, goatse, and lemonparty), lemonparty is probably the tamest of the three by just being hardcore old man gay orgy sex. Believe me, the other two are worse.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

(verb)
To set someones home page to www.lemonparty.org without their knowledge and thereby give them a suprising dose of old man gay orgy when they return to their computer

oh fuck that this is the worst thing ever.

A old man gay orgy that is good at inducing vomiting.

Closly related to the infamous "tubgirl" site. If one goes to www.lemonparty.org, you will withness a old-man threesome. One sucking dick and the other two making out. Possibly the most horrifing thing one man can ever witness.

1.) The result of my boredom on a Saturday night

2.) A game of bingo gone horribly wrong