flob /flɒb/noun 1verb 2forms 3 noun1 •(UK, slang) Spittle or phlegm, especially a piece of spittle or phlegm that has been spat out. verb2 •(UK, slang) To spit or to gob.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 •To flop; to move or behave in a loose or uncoordinated way. formsflobbed · flobbing · flobs