Definition of grockle in English:
nounBritish informal , often derogatory
A holidaymaker, especially one visiting a resort in Devon or Cornwall.
- Everything's damp and miserable out there, not least the grockles [holiday makers].
- These grockles are the least professional of holiday-makers.
- There was a time when you'd go out on a Saturday morning shortly before Easter to do a bit of shopping in town and discover that, all of a sudden, the grockles had arrived and the new holiday season with them.
an invented word, originally a fantastic creature in a children's comic, adopted arbitrarily and popularized by the film The System (1964).