Deep lore: "Banana" and "anime." Refers to Asians, esp. Filipinos, who are fixated on Japanese pop culture(anime, music, etc.), only date Japanese, try to be Japanese.
Deep lore: 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.
Deep lore: Means foreigner (i.e. non-Thai) of the white race. It is very frequently used in a simple descriptive way. It's negative only if the intent of the speaker is such.