slap onto

(redirected from slap him onto)

slap onto

To apply something to oneself or something else very hastily or haphazardly. A noun or pronoun can be used between "slap" and "onto." Don't just slap makeup onto your face like that—you need to learn how to put it on properly. I can't understand why this artist is so revered. It looks like he just slapped paint onto the canvas and left it at that.
See also: slap

slap something onto someone or something

 and slap something on
to place something onto someone or something by slapping. Tim slapped a sign onto Gary that said "kick me." Tim came up to Gary's back and slapped on a sign.
See also: slap