Are shit, shat, and shitted all correct and fine to use as the past tense of shit?
After a little bit of searching it seems that they are, with shat being Old English. Is any form more common in British or American English?
Erik Kowal claims that shit is mostly American English and shat British English.
[M]ost Americans don't change the verb form for the past tense of certain short verbs ending in -it. So fit, spit, shit, slit and pit are thus formed both in the present and the past tense as far as Americans are concerned, whereas people from Britain would almost always use fitted, spat, shat, slitted and pitted for the past tense.
What about shitted?