The phrase "crammed on" is not a standard English expression, so its meaning may depend on the context in which it is used. "Crammed" typically means to be packed tightly or filled to capacity, while "on" is a preposition that can indicate location or attachment. Without more context, it's difficult to determine the specific meaning of "crammed on." If you have a specific sentence or context in mind, please provide more information, and I'll do my best to help you understand the intended meaning.