Slot In Meaning

(transitive) To put something into a slot.

Example: Used other than as an idiom: slot in.
To put something into its desired place
2011 February 1, Mandeep Sanghera, “Man Utd 3 - 1 Aston Villa”[1], BBC:
  Darren Bent slotted in a Stewart Downing cross to give Villa hope but that was ended when defender Nemanja Vidic thumped in United's third.
To schedule something for a particular time.
  I'll slot you in between my 3 o'clock and 4 o'clock appointment.