To add fuel or make a fire burn stronger. Also, to make someone feel more excited or interested about something.
Stoking a fire can make people think of warmth, comfort, and coziness. Stoking someone's excitement can make people think of fun and happiness.
Examples:
She stoked the fire to make it burn brighter.
I stoked the excitement of the crowd with my speech.
He stoked the furnace to make the house warm.
I stoked the cat to make it play with me.
The chef stoked the flames to cook the food faster.
The coach stoked the team's excitement before the big game.