Evidence of a limited vocabulary.
yitbos
There's a time and place for 'most anything, but when I hear people using words in the wrong context I think a little less of them.
For example, if someone is speaking correct English on television, the radio, or in polite society and suddenly pauses and resorts to crudities such as "pee" or "butt", it's obvious that he (or she) doesn't know the words "urinate" or "buttocks", "anus", "rectum", etc., or is somehow uncomfortable using them.