It's funny because it's true
Statement of truth used when something non-fictional, ironic and hilarious occurs.
<GhettoChubb> Me and my sister went down to the supermarket, and this huge fat chick was standing near the frozen-food section, and I swear to God I thought it was my sister, and I slapped the bitch on the shoulder and said 'Losing a little wait?' and the women turned around and kicked me inside a fridge. A closed fridge!
<Hymenia> Hahahh, its funny because it's true.
<Hymenia> Hahahh, its funny because it's true.