tib /tɪb/noun 4forms 1phrases 1 noun4 •(informal) A tibia. •(slang, no longer used) A prostitute.But this woman was, he thought, no tib, no purveyor of holy mutton. — 1964 •(no longer used) A young girl, a sweetheart. •(no longer used) A working-class woman. formstibs Phrases with tib tib outTo play truant.