is an adjective used to politely describe something that is of the interracial nature. It is derived from the stereotype that African-Americans only like mentholated cigarettes, and Caucasians despise them. It refers to the mixing of the two races via their stereotyped preferences.
Person #1: "Marcus is bring home his girlfriend from college today"
Person #2: "That's great!"
Person #1: "Yeah he's in an intermentholated relationship, they were going to repo his car."