At first I was puzzled that PAPER CHASER could ever be confused with BIG FU*** SLUT.
So I gave some thought to it and came up with this ...
They both contain four syllables, like so:
#1 #2 #3 #4
P A P E R C H A S E R
^ ^ ^ ^ ^
v v v v v
B I G F U K I N S L U T
The P/B plosives sound much The non-rhotic R in "PER" sounds CH in "CHASER" sounds Both syllables start with S. And the
alike, esp. with backing music. like the U in "FU***". And the P/F like the K in "KIN". non-rhotic ER in "SER" is sounded as "uh",
sound similar under the backing music. similar to the UT "uh" sound ... with the
terminal T sound lost in the backing music.
But PAPER CHASER has the stress on the first syllable of each word, which I might depict as "*- *-".
The other has its stresses as "* *- *". As such the rhythm is different between the two phrasings.
It's easy to see that the syllables can be "interchanged" ... but I find it puzzling that the ear/mind can be tricked around the rhythm.