Green’s Dictionary of Slang

stab v.

also stob
[the image of the penis as a weapon]

[late 16C–early 17C] to have sexual intercourse; thus stabbing n., sexual intercourse.

In phrases

stab in the thigh (v.)

[late 19C] to have sexual intercourse (with).

SE in slang uses

In phrases

stabbed with a Bridport dagger (adj.) [the best variety of British hemp (used for the noose) was grown near Bridport, Dorset]

[mid-17C–early 19C] hanged.

stab oneself and pass the dagger (v.)

[mid-19C] to take a glassful then circulate the bottle.

stab out (v.)

[1990s+] (US black) to leave.