Justin Bieber Sizzurp Song -- 'We Were Born For This' [LISTEN]

Justin Bieber's so gangsta' these days, he's now droppin' sizzurp similes to describe his interpretation of "love."

The Biebs posted two new songs to SoundCloud -- under the ridiculous name Sir Bizzle -- one of which is an atrocious ballad called "We Were Born for This."

Biebs has never included sizzurp in his music before ... but threw a reference in his new song:

but the boys and the girls
they don’t know
what love is like
love is like appreciation
mixed in a double cup of sprite

Deep.

As TMZ first reported, Bieber has a long connection with sizzurp ... having once been caught on camera in an ATL nightclub holding a double cup.