Green’s Dictionary of Slang

1. (US campus) an ugly man or woman.

1940		S. Longstreet Decade 159: Damn it, you troll.
1967–8		Baker et al. CUSS 213: Troll An ugly person, male [...] female.
1970		Current Sl. V:2 14: Troll, n. An ugly girl.
1990		Eble Campus Sl. Nov. 9: troll – unattractive guy.
1997–2001		Online Sl. Dict. 🌐 n 1. an unattractive female or one of ill repute. (‘She is such a troll.’).

2. (US campus) a notably hard worker.

1967–8

Baker et al. CUSS.

3. (US campus) a small girl or woman, i.e. under six feet (in contrast to a tall one – Munro).

1989

P. Munro Sl. U.

4. (US campus) a lecherous older man.

1989

P. Munro Sl. U.

5. (US gay) an unattractive middle-aged gay man.

1989		Kirk & Madsen After The Ball 321: Ugh! He’s such a troll!
1999		Gaymart.com Queer Sl. in the Gay 90s 🌐 Troll – A man in a cruising area that won’t take no for an answer.
2003		Time Out N.Y. (11th edn) 288–9: Let our gay glossary help you keep everyone...straight. [...] TROLLS.

6. one who acts deliberately to annoy or tease; dominant use has evolved into one who is abusive in an online environment.

2010		J. Lanier You Are Not a Gadget 19: [W]hen you ask people not to be people, they revert to bad moblike behaviors. This leads not only to empowered trolls, but to a generally unfriendly and unconstructive online world.
2012		J. Fagan Panopticon (2013) 44: He crosses the road and smirks back at me. Loser. Fucking troll.
2014		C. Eble (ed.) UNC-CH Campus Sl. Spring 2014 15: TROLL — someone who teases or taunts.