Lemonade
Cure Lemonade, also known as Kasugano Urara, is a character from Yes! Pretty Cure 5. She wants to be an actress or something, her clothes look less like a costume and more like a fancy dessert, her speech sounds like a Pine-Sol commercial, and apparently she's "bursting" or "effervescent" or something. She's the least interesting Pretty Cure character (which may be saying very little or a lot, depending on who you ask), so instead we will talk about something else that is also called Lemonade.
Lemonade (well, actually, #lemonade--we couldn't put the # in the title because wikis are weird like that) is also the name of an IRC channel on the PSIGenix (formerly Xelium) network. It is owned by SammyBeany, but operated by a gang of British mafia extremists. Most members of Sonic Eats Rings who did not come from The Moogle Cavern, as well as many who did, are #lemonade regulars. Indeed, it was in #lemonade that SER was originally proposed.
Nobody's sure why it was named after a character from an anime that would not even exist until several years later. Some have proposed the theory that the channel is actually named after the popular beverage made from lemons, or perhaps after the related expression "when life gives you lemons, make lemonade," but these are clearly nonsense.
How it came to be
Legend has it that #lemonade was a channel used for some secret project or other by SammyBeany and a few others. After an incident occurred in the then-central #SRB2 channel, #lemonade was used as a refuge for banned members of #SRB2. After a period of time, the community of #lemonade grew from "ANGER AT #SRB2 UUURGH" to an actual, somewhat close-knit group of people who have productive (and unproductive) conversation. Many members of #lemonade frequented The Moogle Cavern as well.
Stupid drama
For a time, certain members of The Moogle Cavern held a low opinion of #lemonade, and vice versa. Given the previous section, you might find that strange. What was going on was that certain people would come to The Moogle Cavern on occasion and act in ways disagreeable to the majority of regular posters, and these would mostly be people who rarely posted but were frequently seen in #lemonade (and would often go out of their way to self-identify as such). This led to a misperception among the MC's non-Lemonheads to the effect that the behavior seen as trolling at the MC was typical #lemonade behavior. From there, things escalated, with the people who were both MCers and Lemonheads getting increasingly frustrated with the whole thing.
As of the creation of Sonic Eats Rings, this has finally more or less ended, with difficulties now correctly identified as the interpersonal conflicts they are.