1. To be unceremoniously broken up with, unfriended, or otherwise casual become disassociated with; shown through actions. Can implies the person that put the other down for a better alternative or for bored.
2. To be casually dismissed from a relationship, verbally
3. To be ghosted
1. Ex. Mom talking to Dad: Now that Sally's started high school and made new friends she hangs with them a lot more. I guess she's grown up and put her mom down and doesn't want to hang out with me anymore.
Ex. John can never seem to make it to our outings now, I guess he's put us down
2. Jack to Jill: I think we're better as friends, we should see other people
3. You didn't reply to my text in a few days so I figured you had put me down.
Come (you) and Put it (ass, that booty, pussy, etc...) down on me ( set it on my d)... Another way of saying lets have sex without sounding awkward or strange.