British Slang
A person with no friends, or at least someone who appears that way.
Other similar uses:
1) On his bill - On his own
2) Has been
billied - Has been abandoned (by friends)
3)
A billy - one with no friends
"That Danny lad is a right billy-no-mates."
"Look at that lad over there on his bill."
"
David's been
billied! Haha!"
"Ryan is
a billy..."