Green’s Dictionary of Slang

crap v.2

[crap n.1 ]

1. in the context of defecation.

(a) [mid-19C+] to visit the lavatory, to defecate.

(b) [1940s+] to filthy with excrement.

2. in fig. uses.

(a) [mid-19C+] (also crop) to annoy, to irritate.

(b) [1920s+] to tell deliberate lies (to).

(c) [1930s+] to complain.

(d) [1950s] to chatter.

In phrases

crap around (v.)

[1930s+] to fool about, to waste time; to prevaricate.

crap a smoke (v.)

[1940s] (US) to smoke surreptitiously in a lavatory.

crap in the same can (v.)

[1950s] to be intimate, to be together.

crap it (v.)

[1960s+] to be doomed, to suffer a serious mishap.

crap it up (v.)

[1970s+] to ruin, to make a mess of.

crap off (v.)

[1970s] (N.Z.) to stop talking, esp. nonsense.

crap on (v.)

1. [1920s+] as imper., ‘to hell with’.

2. [1940s+] (also crap over) to treat contemptuously, to victimize.

crap on (about) (v.) (also crap away) [1940s+]

to talk lengthily, if irrelevantly and usu. in a neg. manner (about).

crap one’s pants (v.) (also crap one’s daks)

[1940s+] to be absolutely terrified.

crap someone along (v.)

[1970s+] to tell deliberate lies.

crap someone around (v.)

[1970s+] to annoy, to irritate.

crap up (v.)

1. [1940s+] (orig. US) to ruin by adding unnecessary or distasteful accessories; thus crapped up adj.

2. [1950s+] (orig. US) to make a mess of; thus crapped up adj.