Helping someone through thick and thin is helping them through the good and bad in life. Although no one is entirely sure which one is the bad and which one is the good out of thick and thin
To be able to last through and handle the good times as well as the bad times. (Usually in the sense of a relationship of sorts). Thick is representative of the good times, whereas thin is representative of the bad times.
throgh thick and thin, if something is THICK then it is HARD to get through. If something is THIN it is EASY to get to. through thick and thin definition= throguh the bad and the good.
Noun -- A type of men's dress sock made usually of nylon that is sheer (thin nylon) with (thick nylon) lines running vertically throughout the sock. This type of sock is worn more so but not limited to ethnic groups such as African-Americans and Hispanics. This type of men's dress sock was very popular during the 1960's to 1980's and began to make a comeback during the late 1990's.
Bernard went over to The Sock Man Socks & Shoes to hook up on a fresh pair of thick n thins to match his new suit.