Scam. Drink more water if you want to detox.

Effects and dangers

Some proponents of alternative medicine have claimed that coffee enemas have an anti-cancer effect by "detoxifying" metabolic products of tumors.[4] There is no scientific evidence to support any anti-cancer effect of coffee enemas.[2][5][6]

Coffee enemas can cause numerous side effects, including infections, severe electrolyte imbalance, colitis, polymicrobial enteric septicemia and heart failure.[4][6][7][8][9][10] If the coffee is inserted too quickly or is too hot, it could cause internal burning[11] or rectal perforation.[12] The use of coffee enemas has led to several deaths as a result of severe electrolyte imbalance.[8]

http://en.wikipedia.org/wiki/Coffee_enema