Sorry, no online dictionaries contain the exact phrase that is what.
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Reverse dictionary results:
1. i.e.
 2. in other words
3. in essence
4. that means
5. clarify
6. anything
7. content
8. everything
9. guess
10. say
 11. something
12. than
13. wha
14. whatever
15. whereof
16. who
17. why
18. yeah
19. after
20. again
 21. altarpiece
22. arrow
23. catch
24. concept
25. current
26. damage
27. deal
28. definition
29. dickens
30. dinner
 31. doi
32. earth
33. eating
34. else
35. end
36. gas
37. harm
38. have
39. heck
40. hello

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You can look up the words in the phrase individually using these links:   that ?   is ?   what ?
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that*to search for words beginning with that, or
*whatto search for words ending with what
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