Verb, adj. and noun: A call used by the group GX7 to gain the attention of others during parties and gatherings; sometimes used outside of parties, but simply for the fact of getting a laugh out of people.
Meaning literally 'Seize the pussy' Possibly an anachronistic term having to do with the magistrates in Britain in the middle ages and the rampant alley cat problem. It has evolved into more mundane use.