side note: On the tv show Sanford and Son....(this was the first time I heard of the word 'barracuda')
Why did Lamont call Donna a barracuda?
Towards the beginning of the series, Fred's son Lamont was hostile, even ambivalent towards Donna, a practical nurse, whom he called "The Barracuda." He felt that way because he saw her as a threat to replace his mother, and tried to break up Fred and Donna's relationship.