It is a simple substitution cipher using the language of Kenny McCormick.
Each letter have corresponding code to use.
Here's your guide:A= mmm
B= mmp
C= mmf
D= mpm
E= mpp
F= mpf
G= mfm
H= mfp
I= mff
J= pmm
K= pmp
L= pmf
M= ppm
N= ppp
O= ppf
P= pfm
Q= pfp
R= pff
S= fmm
T= fmp
U= fmf
V= fpm
W= fpp
X= fpf
Y= ffm
Z= ffp
