Green’s Dictionary of Slang

to leave, to go off.

1694		J. Eachard (trans.) Plautus’s Amphitryon I i: I’ll beat ye to mummy, you scoundrel Dog, if you don’t troop off.
1700		T. Brown Amusements Serious and Comical in Works 32: I thought ’twas Time to troop off to an Eating-House .
1900		J. Conrad Lord Jim 46: The white men began to troop out at once.
1996		Eble Sl. and Sociability 101: Farewells are often the equivalent of I must leave now and use various slang substitutes for leave. For example [...] gotta plus [...] slide, split, or troop, all of which mean ‘leave, depart.’.
1997–2000		Da Bomb 🌐 29: Troop: Walk.