slap (
http://definr.com/slap)
n 1: a blow from a flat object (as an open hand) [syn:
smack]
2: the act of smacking something; a blow delivered with an open
hand [syn:
smack,
smacking]
adv : (informal) directly; "he ran bang into the pole"; "ran slap
into her" [syn:
bang,
slapdash,
smack,
bolt]
v : hit with something flat, like a paddle or the open hand;
"The impatient teacher slapped the student"; "a gunshot
slapped him on the forehead"