a man's group of ladies

From Arabic harIm (literally "something forbidden") and haram (literally "a sanctuary")

In Turkey, Persia, and other areas of the Middle East, the harem was a section of a palace where the women of the palace lived. Contrary to popular belief, the harem was not a brothel; that's simply a Western viewpoint. The harem did house the wives (and sometimes concubines) of the Shah, but his female relatives also lived there.

Still, there are many cases where a group of females linked sexually to one male (or males linked to one female) is referred to as a harem.

A genre of anime or manga where the main character is surrounded by multiple characters of the opposite sex. Can often be a yaoi or yuri. A standard harem involves one male character and multiple female characters. If the main character is female it is referred to as a reverse harem.

To quote someone who knows what they're talking about:
"From Arabic harIm (literally "something forbidden") and haram (literally "a sanctuary")"

Although its original meaning was the part of a household reserved for females - including perhaps a man's mother, sisters, and daughters, as well as wife or wives - it is commonly used to mean a group of more than one woman who are all available sexually to a single man. This situation is Polygyny ("multiple women.") Sometimes it also refers to a group of men who are available to a single woman. This situation is Polyandry ("multiple men.") Either may be called Polygamy ("multiple marriage.")

People who think it derives from Latin don't know what they're talking about, which is no great crime - no one knows everything. People who think it derives from Latin and say so on a public forum like this not only don't know that they don't know what they're talking about, but are displaying and perpetuating their ignorance.

What you say when you see a hot girl/guy who you'd "put in your harem" - implies superficial attraction but not wanting to go for long term.

Obviously a reference to the Arabic حرم 'ḥaram' 'forbidden place; sacrosanct, sanctum': a place where female members of a polygamous wealthy family would reside. And be fucked at the husband's leisure. Similar to a 'seraglio'.

Women of a sexual nature from the getto who serviced their man without question. The word comes from the latin language for 'Channel Slut'.

the clogged hair in your bathtub drain

A genre in anime and manga that every weeb indeed watches, however it is never discussed among fellow weebs.

A harem is essentially when there is a boy who is bombarded by a bevy girls presenting various physiques. The girls in the harem are all attracted to the boy and often fight over his affection. A Harem can be metaphorically describes as a rooster in a henhouse.

(n.) a back in the day term for a stable full o' bitches.