telling

You're telling me! (informal)

something that you say to emphasize that you agree with something someone has just complained about because you have experienced it yourself. 'Brenda's really bad-tempered these days.' 'You're telling me!'

See also: you're

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there's no telling

it is impossible to guess. There's no telling how much damage has been done to young people by these “designer drugs.” Even when we don't let them loose, there's no telling what kind of trouble the puppies will get into.

you never can tell