Definition of slammer noun from the Oxford Advanced American Dictionary

slammer

noun
/ˈslæmər/
 
 
1 the slammer [singular] (slang) prisonHe'll end up in the slammer one day.2 [countable] (also tequila slammer) an alcoholic drink made by mixing tequila and lemonade, that is drunk quickly after covering the glass and hitting it on the table to make the drink fill with bubbles