The literal translation of 'lacrar' is 'sealing'. The slang means kind of a victory or good effort from a minority or left-wing enthusiast against right-wing or some opressive majority.

It simple past is "lacrou", like "sealed" in the literal translation.
Anita Sarkeesian "sealed" in her last video
Anita Sarkeesian "lacrou" no seu último vídeo

I'm sure this sociologist's lecture in my campus will "seal"
Tenho certeza que a palestra desse sociólogo no meu campus vai "lacrar"
by zmnricardo September 23, 2015
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