The context of the following conversation is Sasha laughed in their sleeve to hide their face. Sasha didn't want anyone to see.:
Sasha says My boss was at the office party and he was so drunk!  He was really making a fool of himself and I was actually quite embarrassed for him!.
The friend responds I couldn't make it to the party, tell me what happened!.
Sasha responds Well, my boss was drunk like I said, so he got on the stage and took the microphone and tried to sing some old Bon Jovi song, with no background music, and he didn't know hardly any of the words, it was so embarrassing..
The friend responds Oh wow, what did you do?  Did you try to hide how ashamed you were for your boss?.
Sasha responds Yes, I was laughing so hard I was crying, and I had to hide my face in my sleeve so nobody could tell!.
The friend responds Oh, man.  I don't think I could have made it through such a lame party as that.  Next time, you should just skip the office party and come to the party at my house!.