Illegal Mexican immigrants.
"Tonk" is the sound that is made when the illegals are hit over the head with the large flashlights/batons that the US border patrolmen carry.
Usually a person of South East Asian descent, because there name has one or all of the following words (bao, lao, sao). Often used in short form "BLS". A derogative term.
"Hey BLS learn to speak english, your in America!"
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