Im not sure of the general context here, but in the UK gypsy was mostly used to ( derogatorily ) refer to the Romani.
Also commonly called "travelers" due to their nomadic nature.
As with a lot of derogatory colloquialisms its usage has mutated/changed over time and differs between geographic areas.
Modern usage is generally aimed at the groups of people who nomadically move around in large caravan convoys, they may or may not descend from (or identify as) Roma.
They have a poor reputation.
If you've ever seen the movie Snatch , the group that brad pitt is a part of is one example of "gypsies".
Best I can tell, they are "Irish" gypsies but many different variations exist.
huh, i didn't know there was a formalised name for this, TIL