Us, trust, a couple things I can't spell without U
from Justin Bieber (Ft. Big Sean) – As Long As You Love Me Lyrics on Rap Genius
Meaning
(U)s and tr(u)st. Can’t spell those things without the letter U. Also, the words have no meaning without the girl.
Bonus: There is a word that starts with F and ends with C-K that also contains the letter “u” in between it.

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