Meaning

Hello Friends,

It would be my pleasure if you correct me on the interpretation of the bold part.

Dr. Finch had drunk so long and so deep of his heady brew that his being was shot through with curious mannerisms and odd exclamations. He punctuated his speech with little “hah”s and “hum”s and archaic expressions, on top of which his penchant for modern slang teetered precariously.

My interpretation: he got used to be drunk with his strong drinking, that's why he had a curious personality or his personality was odd.

Thank you for your time.