Green’s Dictionary of Slang

afternoon.

2001		OnLine Dict. of Playground Sl. 🌐 avvy n. the afternoon e.g. ‘What time this avvy shall I meet yer?’ f. contraction of afternoon.
2001		K. Sampson Outlaws (ms.) 132: He knows Moby’s got a rehearsal [...] but it’s not until this avvy and mobe’s in no hurry.