I gotta spend one summer in Tijuana with Tia and Tia’s momma
from Big Sean (Ft. James Fauntleroy, Kendrick Lamar & Royce Da 5'9") – 100 Lyrics on Rap Genius
Meaning
The wordplay continues:
Tijuana is the first city in Mexico, across the border from San Diego
Tia is the word for “aunt” in Spanish
“Tia” is also probably the name of a lady who he would have “carne asada” in bed with (see next line), which again, is a popular Mexican meat
He throws in “and Tia’s momma” to continue on the familial theme that runs through the entire song.

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