from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Informal Using principles, practices, or designs copied from and closely similar to those of a rival: "Ready availability of inexpensive components has created an age of metoo hardware in everything from mainframes to personal computers” ( Business Week).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- deliberate misspelling of me too: used to indicate agreement.
Sorry, no etymologies found.