Wiktionary
me three
adv. (context idiomatic humorous English) (non-gloss definition: Used to express agreement, after someone has already said "me too".) n. (context idiomatic English) An expression of support to a position that has already been proposed and seconded.
Usage examples of "me three".
The thicket forced me around to the rim of a steep decline, though I didn't know it until my feet told me three times.
It were worth my while to let you pass, could you give me three new ones of which I cannot answer two, that I may use them in turn.
You sent for me three times yesterday only to ask me the same question, though you know what I think.