Green’s Dictionary of Slang

feel n.

also feelee
[feel v. (1)]

1. [late 19C+] an act of sexual groping.

2. (US) in pl., an emotional response.

In compounds

feel day (n.) [pun on SE field day]

[1910s+] (Can.) heavy petting.

In phrases

cop a feel (v.)

[20C+] (US) to indulge in some form of petting or sexual groping, but not intercourse.

put the feel on (v.)

[1930s] (US) to sound out, to assess.