This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 耵 is uncertain. It combines 耳 (ear) with 丁, but the original function of this compound is unclear.
With 耳 (ear) and 丁 (a nail or T-shape), imagine a tiny nail-shaped earwax piece being removed from the ear. This ties to the kun reading みみくそ (earwax), but the overall meaning remains obscure.
For テイ, picture a tiny earwax piece shaped like the letter T: T -> テイ, and the ear 耳 is where it comes from.