- Red-light district (Words, Sayings, and Slogans)
"Frozen-from-the-waist-down's new roommate? She's a one-woman red-light district."
"Every night since orientation she's been with some new dude."
A red-light district is a neighborhood with a lot of prostitution. In ye olde thymes, brothels would put red lights in their windows to identify themselves as open for business to potential customers. (and some places still do this — ever been to Amsterdam?) Mac is being a bit cruel here by implying that Parker is a prostitute. All indications point to Parker not charging a dime, despite Mac's later assertion that she's got a suggestion box and a tip jar next to her bed.
- 3.01 "Welcome Wagon"