Informal speech form of 'telling,' as in sharing information, narrating a story, or informing someone of something.
From Old English 'tellan' meaning to count or recount. The informal contraction 'tellin'' drops the 'g' sound, common in casual speech across many English dialects.
The fact that English speakers drop the 'g' in 'tellin'' isn't laziness—it's actually how languages naturally evolve through speech, and enough people doing it means it might eventually become the official form, just like 'gonna' and 'wanna' are slowly being accepted in formal writing.
Complete word intelligence in one call. Free tier — 50 lookups/day.