acronym for Smile At
Phone.
You read a
funny or nice message on your phone and its not quite an "
lol" but you are actually smiling and definitely feel stupid
can also be "sap-ing" in which u cant stop smiling
In lecture i got a message on my
phone from a friend and it made me sap.
OR
i'm sap-ing right now because that
text was soo
funny!