n. psychobabble for a person's ability to tell himself apart from those around him. "rigid boundaries" indicate an inability to form close relationships. "no boundaries" indicates a spineless, mindless, asskissing lemming.
Skeevo's got good boundaries; he ain't willing to co-sign for his girlfriend's car loan.
Something that was invented to keep people away when you re sad, mad, or just want to be alone
"dude, I just tried talking to her, but she said that she wants boundaries between us"
"I'm sorry dude"