It's not terribly elegant, but it conveys a sense. I assume it means something like 'How do you avoid falling down so often?'
b
From 《Friends》:
PHOEBE: We were just wondering if Chandler's girlfriend is a girl.
JOEY: Oh, well. Just ask her how long she's gonna live. Women live longer than men.
CHANDLER: How do you not fall down more?
what does "how do you not fall down more" mean?
It's not terribly elegant, but it conveys a sense. I assume it means something like 'How do you avoid falling down so often?'
b
I can only guess (I never liked this show) that it means that Joey is so stupid that it's a miracle his brain works enough to keep him moving around without disaster.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
Maybe she's being sarcastic, saying that he's so funny that he should be ROFL more often (literally).