N/L
Means 'Not a lot here.' You say it when you're too lazy to type a real message, like when your friend asks 'Wuts up?' and you're too tired to answer.
My friend said 'Wuts up?' and I replied 'N-A-L-H.'
At 3 a. m., I typed 'N-A-L-H' and fell asleep.
My mom said 'Wuts up?' and I said 'N-A-L-H' and left.