foooms

Fuck Off Out Of My Store
Verb used by retail staff for dealing with difficult customers (see Karen) who forget that the retail relationship is optional for both the customer and the store.

Sales Assistant: That guy with the new bike was in again today, complaining about everything when nothing is wrong - so I fooomsed him.
Manager: Well done, we're busy. We love a good fooomsing.

foyc

Used with a hashtag in social media streams - foyc alerts admins to commercial posts (spam) snuck into comment threads

Might be a corruption of “fake”, or the o may stand for “off”. Who knows.

John Smith: It’s great tone part of the winning team trading bitcoin using <blah>

Me: #foyc