I mean

[Becky]

Depending on its position in a sentence or cluster thereof, a clarifying statement, a conversational stall, or a slightly apologetic amplifier. Rarely used in formal written communication, but common as a conversational particle in early 21st-century American English.

[Jason Yan]

Meaningless American use of the English language. Often reflective of a complete lack of content in what they are saying - people of average intellect, articulation and education will simply pause and think about what they are saying. Probably due to American television with programs such as “Clueless”, “Legally Blonde” and “the OC”, which depict successful people as not requiring any form of intelligence or decent command of the English language. In real life, these people look stupid, act stupid, and everyone thinks they are stupid. Typically, they fail intelligence tests.

[Justin Bieber]

used to correct what you have just said or to add more information: