You know damn well what it is.
Low/no-interest treasury loans, Federal grants, tax breaks, subsidies...EAR MARK$, PORK BARREL.
I've tried to teach you, there is good corporate welfare, temporarily propping up a major American company in order to protect a large workforce, and there is bad corporate welfare: special favorable treatment for corporations that, when examined objectively, is clearly excessive, unwarranted, wasteful, or inefficient.
Any treatment for individual corporations or group of companies that is anti-competitive in nature and doesn't substantially benefit the workforce/consumers/community.
It's a pejorative term as CEOs and their lobbyists will always argue the benefits and reject the notion of 'welfare'.