Acronym for “Niggas against splashing the youth”. In 2016 niggas were boolin splashing female youth in European countries with acid. This was a movement started to prevent and help forces against these atrocities
I.A.N.T.S.I.A.N.T.M.A.N is from the song Dr. Sunshine Is Dead by Will Wood and the Tapeworms. If someone ever texts you with this, they're only making a reference. The lyrics are as follows: “I am not the sunshine, I am not the moon at night.”