The phrase topo, pq não is everyday Portuguese slang for agreeing to a plan, shortened in writing to pq instead of por que. Clips of the line spread through Brazilian meme pages, group chats and short video edits where a quick spoken yes is funnier than typing a reply. Its popularity comes from how ordinary it sounds, so creators reuse it for dares, last minute invites and bad ideas that everyone accepts anyway. It remains common as a soundboard reaction because the meaning is clear even without context.