To make time for someone or (to do) something between other previously arranged engagements or appointments. I know that the masseuse is particularly busy on Saturday, but I may be able to slot you in sometime after lunch. I'm trying to slot in a yoga class on Monday between my two major business meetings. I find that it really helps keep me calm and focused.

slang The gambling game that is played on a slot machine, or slot machines themselves. I'm no good at card games, so I usually stick to slots whenever we're in Vegas. I'll be over feeding the slots if you need me.