noun
(countable) A blow, especially one given with the open hand, or with something broad and flat.
(countable) A sharp percussive sound like that produced by such a blow.
(countable, music) The percussive sound produced in slap bass playing.
(slang, uncountable) Makeup; cosmetics.
(slang, countable) An eye-catching sticker used in street art.
verb
(transitive) To strike someone, typically with an open hand, often on the face.
(transitive) To cause something to strike soundly.
(intransitive) To strike soundly against something.
(intransitive, stative, slang) To be excellent, especially when relating to music.
(transitive) To place, to put carelessly.
(transitive, informal, figurative) To impose a penalty, etc. on (someone).
(transitive, informal) To play slap bass on (an instrument).
adverb
Exactly, precisely
adjective
(slang, UK) Very good, excellent, amazing.