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what
you-know-what; that thing
whatsit; whachamacallit; what's-his-name; what's-her-name
(not) at all; (not) in the slightest
what?; huh?
hey!; come on!
oh, no (it's fine); why (it's nothing); oh (certainly not)
penis; (one's) thing; dick
何が起きたか教えて。
Tell me what happened.
あの何、例のあれ取ってくれる?
Um, you-know-what, can you grab that thing?
冷蔵庫に何も入っていなかった。
There was nothing in the refrigerator.