To be encouraged by someone who is not at
immediate risk and/or safe from repercussions to do
something stupid. Especially when subsequently caught or hurt.
Similar to
peer pressure except that the snapper'er is unaware/ignorant of the actual risks.
Jim broke his leg after Tony told him it was safe to jump from the roof. Tony saw it on TV so he
thought it was safe. Tony really snappered Jim good.
"Steve, stop telling me to steal the
video game.
I know for a fact they have security cameras. You aren't going to snapper me!"