My maternal grandfather would say "That guy was as soft as a chinaman's slipper" ...

Soft=stupid, i.e. they have a soft head.

As in, "Whaddya soft?"

this one makes no sence to me.. arent they complete opposites? dont the people realize they dont have anything in common?

also, "soft as a sneaker full of sh*t"

I agree with the other commenters. Soft is stupid or slow. My mother would say, "I musta been soft to think yous would come back with change after I told you to only buy some tonic and fudgicles. Now gimme that change; it's my-in."Kate from the Merrimack ValleyActually first from Chemsfed, then from Boston, then J.P., then Lowell, then Beacon Hill, now Haverill.

Basically stupid but also with some crazy potential.Someone soft in Dot wasn't just dumb but kind of wacky and would do crazy soft.My friend was hammered and acting up at his house once and his father just shook his head and said, "You're soft as puppy shit."Pretty much sums up the usage.

My friends mother used to say "soft as puppy sh*t".