1. mod. pertaining to a very strong and well-built person. (Usually refers to a male. Refers to the sturdiness of an outhouse [outdoor toilet] built of brick rather than the traditional wooden outhouse. Usually objectionable.) Chuck is built like a brick shithouse. The only fat on him is where his brain ought to be.
2. mod. pertaining to a beautiful and curvaceous woman. (Refers to the imagined curving and uneven walls of an outhouse built hastily and carelessly of brick. This sense is a misinterpretation of the first sense. Usually objectionable.) Look at that dame! She’s really built like a brick shithouse.