One may be referring to:

dipstick tail

A tail with a different color on the tip. Remember to tag what color that is with ([color]_tip)
post #5524772 post #5288849 post #4780726

painting with tail

Using a tail as a paintbrush.
This does not implicate paint on tail since one could also do the action of painting with say… icing or mud.
post #3543307 post #2890783 post #5495766

paint on tail

Apply case by case. It might not be paint on the tail. It may be syrup.
post #5475049 post #3569652 post #5318726

tail tuft

A tuft of fur on the end of the tail making the end look larger than the tip should be.
post #4979849 post #5293230 post #5071363

Many of these can be true at the same time.
For instance post #5111978
post #5111978
His tail is a tuft with paint on the end making it have a dipstick appearance.

This is not a dipstick tail (needs improvement).
post #4836834