Green’s Dictionary of Slang

pissing-tail adj.

also piss’n’tail, pissy-tail
[piss v. (1) + tail n. (1); the image is of a toddler still wetting itself]
[20C+] (W.I.)

1. esp. of a young person, disrespectful, bumptious.

2. officious but impoverished and socially unimportant.