Bum, homeless person. Used to describe someone living on the street or lacking basic hygiene and stability (на вокзале опять бичи собрались — “the local bums gathered at the station again”).
На Тверской стоят бомжематы — принимают у бичей стеклотару, выдавая взамен деньги.
There are special recycling machines for the homeless on Tverskaya Street, where they can exchange glass bottles and cans for money.
(Артемий Лебедев @ ЖЖ, 05/2011)
