Uncertain; possibly imitative. Possibly a Blend of phlegm + gob
Meanings
(UK, slang) To spit or to gob.
I pointed out that they both looked equally unhappy, and that he was essentially kicking himself. He contemplated this for a moment, then flobbed at me and kicked the weakling slightly harder. 27 September 2010, Charlie Brooker, The Guardian:
Every day she would flob on Zoe’s head from the flats as the little girl walked to school. And every day Tina would laugh, as if it was the funniest thing in the world. 2012, David Walliams [pseudonym; David Edward Williams], Ratburger, London: HarperCollins Children’s Books, →ISBN: