|2.||lost my shit|
When one cannot keep control of oneself.
I tried to hold on, but I totally lost my shit!
|1.||lost my shit|
When you completely break down or lose control. Can be used positively or negatively.
"He tripped and fell into the pool and I totally lost my shit; I couldn't stop laughing."
"He tried to shove me and I lost my shit; I beat the hell out of him."