Hypocorrection
Hypocorrection is a sociolinguistic phenomenon that involves the purposeful addition of slang or a shift in pronunciation, word form, or grammatical construction and is propelled by a desire to appear less intelligible or to strike rapport. That contrasts with hesitation and modulation because rather than not having the right words to say or choosing to avoid them, the speaker chooses to adopt a nonstandard form of speech as a strategy to establish distance from or to become closer to their interlocutor.