I will sincerely take your dear like a g...and you ain't even let her

from Loki – Mass Appeal Lyrics on Rap Genius

Meaning

Closes out with wordplay as the beat fades
“I WILL SINCERELY take your DEAR like a G and you aint even LET HER”

“let her” is word play for letter. He is saying that even though you been guarding your girl, holding her down, and wife'n her he still seems to get her. (build off last line “imma thief imma robber”)

A Will is generally in the form of a letter
Sincerely is a closing of a letter
Dear is prior to the body of a letter
G…is just a plain ole' letter

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