Getting Crap Past the Radar/Web Comics

The Comics I Don't Understand site has an entire page devoted to this. They call it the "Arlo page".
Erfworld apparently has a profanity filter built into the physical laws of the universe (causing cusswords to come out as "boop"), but clever phrasing can get the point across anyway.
- The word "crap" doesn't trigger the profanity filter, making it a literal example of the trope title.
  - And then "Fuck... You!!" at the end of Book 1 isn't a straight example of this trope, but rather a Crowning Moment of Awesome where Parson defies the world/game's mechanics through sheer force of will.
PS238 has the school's janitor/super tech genius install a chip in a ranting kid's brain that replaces curse words with random non-curse words, and "entire tirades of profanity with showtunes"… "Mostly written by Rogers and Hammerstein"; see it to believe it.
Played with in this Stolen Pixels.
One strip of The Non-Adventures of Wonderella has the titular heroine give up her voice.

Patrianna: [reading her note] "Eat a cant"?
Queen Beetle: Her "u"s look like "a"s.

Normally, Carrie from Everyday Heroes doesn't use anything stronger than "Holy cow!"; however, extreme shock will cause her to exclaim "Saint Francis University!!" ... which is her way of saying ST F U.
In-universe example: Agatha in Girl Genius doesn't realize the implications of some of her lines in The Socket Wench of Prague until she finds out the context for them.