Hey, Mike was no dummy. But every time he tried to get his nest egg to his granddaughter, it ended up in Uncle Sam's pockets.

from Breaking Bad (Ft. Peter Gould) – Granite State on Rap Genius

Meaning

Mike Ehrmantraut was Gus Fring’s badass right hand man and Walt’s former business associate (before Walt wasted him). Mike set up a bank account for his granddaughter Kaylee for when she turned 21 and made other attempts to make sure she received the money he worked for (much like what Walt is trying to do). However, since the DEA knew he was involved in a meth operation they put an end to every one of his attempts to get the money to her. Walt might be in for a similar fate.

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