The Cheek!

I had this conversation with DN last night. He was fixing his race car together and talking to me.

DN : Put sick in!
Me : Huh? Sick? Sick?
DN : (pointing at the car's engine) Put sick in!
Me : Stick? Do you mean stick?
DN : (shakes head) Put sick in!
Me : Skip? What skip?
DN : (shakes head) Sick! Sick!
Me : Take your pacifier out DN, I can't hear what you're saying.
DN : (takes pacifier out... but still sounds like he's asking me to vomit in his car) Put sick in!
Me : Stick? What do you mean? Put the stick here??? What are you saying???
DN : Sick! Sick! Put sick in!
Me : I don't know what you're talking about! Sick? Sick???
DN : Ahhh, never mind!

The cheek!

ps : I still have no clue what he was trying to tell me.