Found 4 phrases starting with AY:

ay up me duck	A generic greeting.	Rate it:
AYBABTU	Initialism of all your base are belong to us.	Rate it:
aye aye, sir	The correct and seamanlike reply, onboard a Royal Navy (or U.S. Navy) ship, on receipt of an order from someone of senior rank or authority. It means "I understand the command and hasten to comply with the order."	Rate it:
AYT	Initialism of are you there? : a telnet command sequence sent from client to server to verify that the connection is still active.	Rate it:

We need you!

A stands

B holds

C resides

D waits