How much bigger do you appear after working out a specific muscle

The following day is when the area seems the most pumped after I get food in.

So when I do Pull day on Friday my back/traps/biceps are pumped on Saturday from food. They're flat on the Friday after having trained those muscles, I assume that's because they're recovering, then on Saturday they've absorbed all the nutrients/water and expanded again, hence the following day pump in those muscles.

Actual size increase? Minimal. Your own perception of that muscle? It grew fucking 4 inches.

pretty much right after working it. then it slowly decreases over time, with late the next day it being normal looking again.

if you want to impress underage sluts, do pushups/pullups/chinups right before entering the room to get maximum pump going