A small deal is the opposite of a big deal. A small deal is something with nothing in comparison to anything else in the world except other small deals. You can recognize a small deal if you call them a small deal and they start to complain or cry or something like that. If you do call them a small deal make sure you are a big deal and not a small deal yourself.
Man 1: "Man that girl Makayla is such a freakin small deal!"
Man 2: "Yes, I know, good thing we are big deals or else I would have to kill myself"
Makayla: "Hey guys!"
Man 1: "Get out of here you small deal!"
Man 2: "Yeah!"
Makayla: *goes off and cries*