A stack of chris chan, chris chans, a chris chan, or a channy, is a reference to the uncanny resemblance Chris Chan has to Benjamin Franklin, who appears on the 100 Dollar Bill. To have a stack of "chris chan" is to mean you have acquired an immense amount of wealth.
Similar to a "Band", "Benjamins", "Bennies", and "Hunnids" to name a few.
Some people say "smoking that chris chan"/"smoking a pack of chris chan" as well, to reference an extravagant lifestyle, referencing either expensive product that is being smoked, or referencing their lavish spending habits.
I'm in the mountains smoking a stack of chris chan, I'm fiending for yodie land...
Spin the block I'm shaking these nigga's down, thinking they thugs until I make them do the chris chan flow