A general term used by a man when being checked out by a woman. A male can also give the micky eye to a woman he fancies belting one into later (after pints). Originally came from a bird caught staring at a mans package. An extension of this is when a bird is giving it socks flirting with you - micky eye mania
"you're one over there is giving me the micky eye" said Jay. "Feck off jay she isn't you're only an ugly mickyhead, and she's minging anyway"