Espetinho literally translates to "little skewer" or "kebab". It's a common street food in Brazil, often grilled meat on a stick.
In the song, the singer contrasts his humble offering of an "espetinho" and a ride in his old car with a rival's ability to provide luxury. He argues that true love doesn't need to be bought, making "espetinho" a symbol of authentic affection over material wealth.
This song is a classic story of love versus money, told in a very direct and funny way. Gusttavo Lima sings from the perspective of a guy whose ex-girlfriend is now with a very rich man. He lays out the competition, and it doesn't look good for him! With the new guy, she gets the VIP section (só camarote), while with him it was just the regular crowd (só muvuca). The new guy has an unlimited credit card, while his own só dava recusado (was always declined). It's a brand new car versus his old one from 2004. He asks, Como é que eu vou bater de frente / Como esse desgramado (How am I going to compete / With this damn guy).
But then comes the big twist. He insists that despite all the luxury, she doesn't actually want it. He claims she would rather have the simple life they shared. The song's core message is in the chorus: she Prefere 'tá comigo, andando de golzinho / Comendo um espetinho (Prefers to be with me, riding in a little Gol / Eating a kebab). He believes his affection is worth more than anything money can buy, singing, Eu tenho o meu valor... Eu não preciso comprar seu amor (I have my worth... I don't need to buy your love).