"Mamasita" is a misspelling of mamacita, the Spanish for "little mother". Rather like the English word "momma", mamacita can mean a mother of both the standard and the red hot kind.
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!