what the fuck does this code do. i dont even understand where to begin 

"THIS IS AB EXAMPLE OF SHITTY OBFUSCATION !!!" "DONT FUCK WITH ME. THE OUTPUT IS 21 becouse 9+10 EQUALS 21"
def decrament(A, AA): AAA=A * AA; "DONT DELETE !!!"; exec('print("\x54h\x65 \x72\x65\x73\x75\x6C\x74 \x6F\x66\x20\x74\x68\x65 \x6D\x75\x6C\x74\x69\x70\x6C\x69\x63\x61\x74\x69\x6F\x6E\x20\x69\x73\x3A\x20", AAA)');
def incrament(a,b): return a,b; # def incrament(A, AA): AAA=A + AA; "DONT DELETE !!!"; exec('print("\x54\x68\x65 \x72\x65\x73\x75\x6C\x74 \x6F\x66\x20\x74\x68\x65 \x61\x64\x64\x69\x74\x69\x6F\x6E\x20\x69\x73\x3A\x20", AAA)');
# # OUTPUTS THE NUMBER RETARD exec('1-1'); 
incrament(9, 10); "GUESSING NOW!!!"
class AAAAA: init_m="DONT DELETE !!!"; init_w = exec("init_m+2+2+\"COMMENT\""); A, AA= 0, 0; exec('for i in range(10):\n A+=1'); exec('for i in range(5):\n AA+=1'); exec('1-1'); decrament(A, AA) # SPECTATE ME