The meaning of speck

Hi
Please help me to know what "speck" means here in this extract:
“The boy reached into his pocket and pulled out the combination corkscrew- bottleopener the schoolteacher had given him. "My uncle give me this, " he said. "He ain't so bad. He knows a heap. I speck I'll be able to use this thing some time or other, " and he looked at it lying compact in the center of his hand. "I speck it'll come in handy, " he said, "to open something. "

I couldn't find any meaning in dictionaries that it makes sense here