Eks Dee
The audio transcription of XD when pronounced. Often used in all caps to show that you're laughing so hard that a simple XD is just not enough to describe it.
Person 1: Hey, have you seen this image? It's so funny words cannot describe it
Person 2: LMFAO EKS DEE *wipes tears* that some real funny shit man
Person 2: LMFAO EKS DEE *wipes tears* that some real funny shit man