a term to use when bashful about using the word 'date' with a person of the opposite sex (or same sex if you swing that way). endogenous to Rutgers University, New Brunswick campus
Signalling to another via the medium of text the fact you are carrying out an action, in this case, the movement of raising the shoulders, which highlights the point you are basically saying 'I don't know' or 'whatever' but in a non-verbal manner.