What is "yesternoon"

Usage examples of "yesternoon".

Hastening down to Sirlptar on the night-cloaked roads of Silvertree seemed a far less sensible idea than it had yesternoon, in the full light of the beating sun.

I was pacing the balcony of my dwelling yesternoon, preoccupied with the repeated failure of certain plasma drills I had designed for Mister Thoggosh, when I missed my step—I'm not quite sure what happened—and fell over the rail.