MS Paint
I recently struggled to think of the word ‘Oval’, so instead landed on “the circle rectangle”.
nitnitwickywicky

Dude of Honor
Couldn’t remember groomsmen, went with dudesmaids instead.
SuperBrentendo64

He’s Not Wrong
To this day most of my family refers to a strainer/colander as a “noodle stay, water go” because my older brother called it that once when he couldn’t find it and needed to ask where it was.
starshock990