I googled this and given that it is a sample sentence meant to be altered to represent deletion and insertion of genes in a DNA sequence I'm going to say its meaning isn't important.
If you want it to mean something I would just assume it takes its literal meaning 'the boy cut his lip (by accidentally biting it) and ate the hotdog'.
4. Oktober 2015
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Maybe "opened the mouth to eat"?
4. Oktober 2015
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