The phrase "weak sauce" means that something is not good or impressive.
Sentences with «weak sauce»
Its still weak sauce to go away from your talent for the future. (sbnation.com)
Other than that, Suburbicon feels like weak sauce, impressive only in how pitilessly evil its main characters are. (theatlantic.com)
These laws may be weak sauce in some regards, but they most definitely do not allow operators to block or degrade any kind of Internet traffic for the kinds of purposes outlined in Three's rationale. (fortune.com)