Maybe they make a mistake,the word "摁" had been spelled "嗯" "摁"means press with hand "嗯"means "oh","yes","I know"

摁 means 按 （press） if someone sends this word in a chat (just this word or at the beginning of one phrase), it's a mistake, what he want to say is: 嗯 this word means ok, I agree, good and so on. u can simply say it means OK

in fact, it should be 嗯 in chinese, they almost have the same pronounciation. 摁 means press with finger or hand. and 嗯 is a modal particle(语气词)，it means :yes/well/hum/let me see/i know

摁，en castellano es "si;poder;entender"

Thanks you all people. This little thing was driving me crazy :-). I really appreciate your help.