Green’s Dictionary of Slang

smack v.

1. [late 16C–1960s] to kiss.

2. [late 18C+] (also smack about, smack around) to hit, to beat; thus smacked, hit, beaten.

3. [1930s–50s] to throw (into).

4. [1990s+] (US black gang) to act sycophantically, to toady.

5. [1990s+] (US black) to criticize someone behind their back [ass n. (2)].

6. [1990s+] (also smack ass, smack it) to be very good, to excel.

7. see snack v.1

In phrases

smack about/around (v.)

see sense 2 above.

smack ass/it (v.)

see sense 6 above.

smack (the) calfskin (v.) (also kiss the calfskin) [the SE calfskin cover of the Bible]

[late 18C–late 19C] (UK Und.) to kiss the Bible when taking an oath.

SE in slang uses

In phrases

smack around (v.)

[1920s] (US) to travel in an ostentatious manner, to parade.

smack down

see separate entries.

smack it (v.)

[1950s] (Aus.) to hurry.

smack up

see separate entries.