Green’s Dictionary of Slang

order v.

also orderly
(Polari)

1. to leave, to go.

[UK]P. Baker Fabulosa 296/1: order, orderly 1. to leave or go .

2. to reach orgasm, i.e, play on to come v.1 (1)

[UK]P. Baker Fabulosa 296/1: order, orderly [...] 2. to orgasm (i.e., to come) .