We could flood the streets
With love or light or heat

from MGMT – Youth Lyrics on Rap Genius

Meaning

As in, we could fill the streets with love, light, or heat.

“Love” and “light” are both associated with “heat” or warmth — love making one feel warm and light being a source of heat.

Although contrary to MGMT’s “modern hippie” stance, “heat” could refer to guns, in conjunction with the opening of the prior line.

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