“Lost in thought” is the simplest explication of this, but a better reading focuses on thought that is opposed, disrupted, damaged and finally sent in the wrong direction back to its futile beginning.  With “ugh” and “tough” being disconcealed in the process further to suggest the losing struggle for meaning expressed.   In short, a deft pwoermd.  A visuaol one as well as infraverbal because you can see the word’s letters metaphorically enacting the struggle.

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