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]

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

[WI]S. Naipaul Fireflies 135: ‘To hell with that piss’n’tail Wilkie’, he cried.
[UK]P. Baker Blood Posse 47: You little pissing tail good-for-nothing.

2. officious but impoverished and socially unimportant.

[WI]Allsopp Dict. Carib. Eng. Usage.