This phrase is a merging of two terms: the terrible internet provider (Comcast) with the chess term (gambit), a tactical and deliberate sacrifice of a chess piece. However, the Comcast Gambit is unique from all others in that it fails to be either voluntary or tactical.
2. After completing his essay final by 11:55 pm, Leland proceeded to submit it online before the 11:59 pm deadline. However, his shoddy internet service was down -- a textbook Comcast Gambit.