BEM - What does it mean?

Noun

(en-noun)

(science fiction|fandom slang|often|derogatory) A stock character in science fiction; a grotesque creature, often an extraterrestrial, that menaces the protagonists.

* {{quote-magazine

| year = 1940 | date = November | first = Parmer | last = Farrell | authorlink = | magazine = | title = The Reader Speaks | volume = 18 | issue = 2 | page = 120 | passage = Incidentally, made them out. }}

* {{quote-book

| year = 1997 | first = Lawrence | last = Miles | authorlink = Lawrence Miles | title = | page = 89 | isbn = 9780563405771 | passage = This is my first time in active BEM service. They've never let me near the Bugs before. }}