It does have a defined meaning, doesn't it? "to chicken (out of something)".

riffraff · on June 6, 2013

I though it was grammatically incorrect anyway i.e.

(the) (adj)chicken (name)chicken (verb)chicken

misses an "s" either on the verb or the name.

But it could be an imperative form perhaps? As in "coward poultry, get out of there"

James_Duval · on June 7, 2013

Hah, that is exactly what I thought.

It doesn't lend itself well to strings of words longer than 3 though, because you can't "chicken" someone, as far as I know - and I don't intend on visiting Urban Dictionary to find out.