Definitions by RoisinSamuel

ISI 

Used on Snapchat , means ‘if seen ignore’. Sometimes said as iis, ‘ignore if seen’.

Going out now , isi

ISI by RoisinSamuel November 9, 2017

STM 

Used on Snapchat , normally on lines or shoutouts. Normally means ‘Should Talk More’ but is also an abreviation for ‘Sent To Most’.

‘Like my recent on instagram stm’

‘Sarah - funny , very nice , so pretty , stm!’

STM by RoisinSamuel November 9, 2017