Slap pretend character (4-2)
I believe the answer is:
make-up
This might be a double definition.
'slap' is the first definition.
(I've seen this before)
'pretend character' is the second definition.
'make up' can be an answer for 'character' (your character or personality is your make-up). I'm unsure of the 'pretend' bit.
Can you help me to learn more?
(Other definitions for make-up that I've seen before include "Bury the hatchet" , "Put together" , "Composition - cosmetics" , "foundation?" , "Cosmetics, face-paint" .)