It literally translates to "nothing" or "it's nothing", but is used in the same way as "you're welcome" to acknowledge gratitude.
Here are some other ways to say "you're welcome" in Filipino:
* "Walang problema" (No problem)
* "Okay lang" (It's okay)
* "Huwag kang mag-alala" (Don't worry)
* "Para sa iyo" (For you)
The best option to use depends on the context and your relationship with the person. "Walang anuman" is the most common and polite response.