Definition of "sumthing"

"Fool, you crazy or sumthing?"

2005, Dana Jamar Mask, Enter … Brotherhood‎ (fiction), page 178

just to clarify sumthing, i am not overwhelmingly good at math as u guys seem to be, so it may take me more time than u guys to understand sumthing …

2009, Gerry Stahl, Studying Virtual Math Teams‎, page 144

… and sum-how that makes you feel good about yourself—as if you've accomplished sum-thing—as if you're worth sum-thing and not nothing.

2014, Darth Figpucker, evi1 - a novel about you‎ (fiction)

… so that they can see if there might be sumthing wrong before they try to go thru the gate.

2015, LT Wolf, The World King (fiction)