1. [17C–early 18C; 1940s+] the penis.
2. [mid-19C] a policeman [? SE worm, an unpleasant, despicable person].
3. [1910s–40s] (US Und.) silk; thus worm-worker, a thief who specializes in stealing silk [play on SE silkworm].
4. [1920s–40s] (US) in pl., spaghetti; thus worms in blood, spaghetti in tomato sauce.
5. [1960s] (US campus) a notably hard worker.
6. [1980s+] (drugs) phencyclidine [ety. unknown].
[1960s+] (orig. US) an eccentric, one whose mind is ‘full of worms’; thus living on a worm farm, crazy, eccentric.
[1930s–40s] (US Und.) selling fake silk.
[1990s+] to masturbate.
SE in slang uses
[1940s+] a corpse.
[mid-19C] (US) a foot soldier.
[1990s+] a very unpleasant person; thus a general term of abuse.
[1940s+] (orig. US) addressed to a supposed virgin, this phr. is intended to shame or bluster her into intercourse.
[late 19C–1930s] to have a drink of alcohol.