Vocabulary

ਰਗਾਂ
ragaan

veins. 'Ragaan dekh' = look at his veins = you can see the effort/intensity in his body.

noun
In this song
7.7 Magnitude · Karan Aujla
Verse 2
ਤੀਜਾ ਕਹਿੰਦਾ, ਰਗਾਂ ਦੇਖ ਲੱਗੇ, ਮਾਲ ਚੱਕੀ ਆਉਂਦੈ
teeja kehnda, ragaan dekh lagge, maal chakki aundai
Third says, look at the veins, he's clearly loaded up.