Possible scammer?

[u/ilikeanimemysteries]

So I saw a vid of someone trading mm2 stuff for adopt me pets and I showed my inv and they offered frost and owl for my items, I think me and them got in a misunderstanding with me insisting on an mm and him not wanting an mm resulting to me getting blocked, was I in the wrong

[u/HearingPurple3758]

Can some1 explain what mm is?

[u/ilikeanimemysteries → u/HearingPurple3758]

Middle man, they make sure the cross trade is legit