When a man calls his lover "little scoundrel", it may have the following meanings:

Express doting "Drowning": This term may be a way of intimacy. A man uses "little scoundrel" to describe his lover's cuteness or naughty nature, implying his love and affection for his lover.

Describe character traits: The word "cheap" can be used to describe a person's character traits that are willful, naughty, or like to cheat. A man may feel that his lover has such characteristics in some aspects, so he uses this title to tease or describe her.

Increase interest: This title may also be a special title between two people, used to increase interest and uniqueness in an intimate relationship.