Having so much money, you can't count it, nor would you need to. May imply a blase attitude about the money, or sometimes the lack of intelligencenecessary to keep track of it.
"So your friend just went and bought you a new tractor?"
In the case of expressing or emphasizing an act of absolute stupidity and ignorance, "that guy's head is in the clouds and he's walking in traffic! That's frilliant.
*or*
"Whoever invented memory foam was frilliant! I love my new mattress sooo much!"
An arbitrarily large number of something, each individual part of which is of little consequence. From "frill" (something not necessary) + "illions" (suffix on many large numbers)