F.F.F.. Fragilisticxpelidotious... because it expresses almost everything in one way or another :)
when ya kick ya toe
when ur shocked of what someone said
when ya computer freezes and ya really fo'd lol
when ya drop something valuable an it shatters
whe ya workin ur butt off in the freezing cold rain and someon says something to ya that really grates..
the ef... word can express sooooo much, in ohh soo many ways ;)
an if you're thinking a bad word.. would I do that.. hehe
some substitutes... fob, flock, fudge, frolic, frig, fry, fart, fred, flamin cat! freakin...
if it start's with F... i'm happy usin it hehe