Green’s Dictionary of Slang

a-yo! excl.

a greeting.

1995		L. Stavsky et al. A2Z 3: ayo – hello: Ayo, bro, you got my dough?
1997–2001		Online Sl. Dict. 🌐 a-yo 1. a greeting. Synonymous with ‘Hey!’, ‘What’s up?’, etc. (‘A-yo, Jessy what’s the dills?’).