Having a one hundred inch television is pretty impressive, seeing as that is a huge television.
But in this line the bragging doesn’t end with just talking about TV’s. Drake saying
Damn I look great on it
refers to Drake always being on television, between his music videos and interviews. This shows how famous Drake is right now.
Another possible meaning behind Drake “looking great on his TV” could be that his TV is so big that he can see his full reflection, but this explanation is of course less likely. This could also be referring to his role on the t.v. show Deggrassi, which he was on before he got famous.
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