* "Ajajajajaja": A sound of laughter or amusement.
* "Ke onda": A Spanish phrase meaning "What's up?" or "How's it going?"
Therefore, it's possible the phrase is used to express amusement or to jokingly ask someone what's going on. It's important to note that this is a very informal and slangy phrase, likely used only in specific contexts or by a particular group of people.
However, without more context, it's impossible to definitively determine the meaning.
Do you have any more information about where you encountered this phrase? Knowing the context (like the conversation it came from) can help figure out what it actually means.