Something someone would
say if he has experience of any
sort, particularly a
soldier's battlefield experience.
All in all, this phrase is self-explanetory to whatever meaning you desire.
"Screaming, killing, explosions.....I've seen it all."
-a
soldier
"
Murder, punks, drugees..... man I've seen it all."
-a thug
"When she removed her
thong man......I'VE SEEN IT ALL!!! ^.^ ^.^ ^.^ "
-a perv