And I'm watching my pops in the back row grinning
With his glass up to my mom, toasting his Guinness

from Macklemore and Ryan Lewis (Ft. Macklemore) – Victory Lap Lyrics on Rap Genius

Meaning

His dad must be proud that he stop using drugs and is now making it in the music industry.

The toasting his Guinness refers to Macklemore’s irish roots, he mentions them in “Irish Celebration” and a few other tracks.

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