(idiomatic) Equivalent retribution; an act of returning exactly what one gets; an eye for an eye.

(Cockney rhyming slang) A hat.

Lophophanes cristatus, a small bird of the tit family Paridae, with an erectile crest, the tip of which is often recurved.

(Cockney rhyming slang) a shit

Cyanistes caeruleus, a small bird of the tit family Paridae, with an azure blue crown and dark blue line passing through the eye and encircling the white cheeks to the chin.

(ornithology) Petroica macrocephala, the miromiro or New Zealand tit, a bird of the Petroicidae (Australasian robin) family.

(sexuality, vulgar) The stimulation of a penis by someone's breasts, usually until the point of ejaculation.

(transitive, sexuality) To stimulate one's penis between the breasts of (a person).

Having the characteristic of returning bad for bad.

plural of tit for tat (both senses).