The word "anda" is used very often in colloquial Spanish to express different things. It can indicate surprise, disbelief, rejection, admiration, emphasis, irony...
These are the main contexts where it is used:
Anda: to encourage/ask someone to do something.
Anda: to show surprise or admiration
Anda que, anda que no: to express something with irony/sarcasm
Note that depending on what they convey, these expressions using anda, anda que, anda que no, can have very different translations as there is no direct equivalent in English.
Anda is an invariable word in these cases, coinciding with the imperative form of the verb andar, but here it's used as an idiomatic expression and is completely disconnected from the meaning "to walk".
There are short expressions using the word anda that are used on their own as exclamations, meaning different things depending on the context. For example:
Notice when using anda que..., anda que no... (when anda and que are part of the same phrase) that que does NOT have a written accent:
¡Anda que tú! ¡Anda que no hace calor hoy!
¡Anda qué tú! ¡Anda qué no hace calor hoy!
Qué only has a written accent after anda when qué is not part of the same phrase:
¡Anda, qué desastre!
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