In a situation when one person says something, and another one agrees with them, he/she might say "Me too". If you also agree with them, but don't want to be seen as boring (by saying "Me too" just like that second person) or stupid (by saying "Me too too") you might want to say "Me three".
Three students during a lecture:
Wojtek: What I wouldn't give for a Playstation 3 right now!
Sebastian: Me too!
Adam: Me three!
A phrase used towards an individual's significant other during sexy times to pleasure and/or excite them. It is most known to work on those who are attracted to Doodlebob, marine biologists, people who really fucking like sponges, people with gibberish kinks, and/or those who enjoy the Shrek movies.
And the lover whispered into his partner's ear, "Me hoy minoy...". After a momentary pause, they responded with a gasp and "Bwah ha whah".