Green’s Dictionary of Slang

lot n.2

[ext. of SE the lot, everything]

the male genitals.

[US]S. King Long Walk in Bachman Books (1995) 296: I’d bet my dog and lot you never slipped it to that girl of yours.
[UK]Partridge DSUE (8th edn) 702: [...] late C.19–early 20.