look up any word, like blumpkin:
 
1.
The cool, refreshing underside of your pillow.
It was getting really hot in bed, so I flipped to my chillow.
by Count Suckula May 30, 2007
 
2.
A pillow that has been left outside the blanket and has now become reasonably cold.
This is ideal for any sleeping situation.
I finally got into bed and realized I have a new chillow.
by JD Rips April 19, 2010
 
3.
A mixture between the terms chill out and allow. No-one really knows what this means.
Um... chillow, dude, chillow
by rorz758 July 14, 2006