Important !! Tinyfugue is not Y2K compliant.
Luckily, your good friend, the man in black, has the fix right here!
Add this to your tf startup file and you too will do Y2K:

/def -p9999 -ag -hSEND y2k = \
  /let new=%*%;\
  /let i=$[strchr(new,"y")]%;\
  /while (i != -1 ) \
    /let new=$[strcat(substr(new,0,i),"k",substr(new,i+1))]%;\
    /let i=$[strchr(new,"y")]%;\
  /done%;\
  /let i=$[strchr(new,"Y")]%;\
  /while (i != -1 ) \
    /let new=$[strcat(substr(new,0,i),"K",substr(new,i+1))]%;\
    /let i=$[strchr(new,"Y")]%;\
  /done%;\
  /if (substr(new,0,4) =~ "sak ") \
    /let new=$[strcat("say ",substr(new,4))]%;\
  /endif%;\
  /send %new