Green’s Dictionary of Slang

crap adj.

[crap n.1 ]

[1930s+] a general negative description; unpleasant, disgusting, repellent, worthless etc.

In derivatives

craptacular (adj.)

[1990s+] exceptionally mediocre.

craptageous (adj.)

[2000s] (US) exceptionally mediocre.

craptard (n.)

[2000s+] (US) one who is both foolish and an advocate of stupidity.

craptastic (adj.)

[2000s] (US) exceptionally mediocre.

In compounds

crap-ass (adj.)

[1970s+] (US) second-rate, inferior.

crap course (n.)

[1950s+] (US campus) an easy course.