Exhausted, very tired, as in I was all tuckered out after that game. The precise origin of this usage is not known. [Colloquial; 1820s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
Examples from the Web for tuckered out
There lay the little 'tuckered-out' man, as smilin' as a basket o' chips!My Fire Opal, and Other Tales
Sarah Warner Brooks