In addition to the topic
Hidden smiles in Skype I will add new smiles that appeared in the updated
Skype version 5.5So, here they are:

“This is a failure” or “oh no” = (facepalm) or (fail)

“Work from home” = (wfh)

“Crossed fingers” (for good luck) = (yn), (fingers), (fingerscrossed), or (crossedfingers)

“I’m not listening to Lyalalyalya” = (lalala), (lala) or (notlistening)

“Waited” or “well, how much is possible” = (waiting), (forever), or (impatience)

"Give five" = (highfive), (hifive), or (h5)

"Rolling field" = (tumbleweed)
')
Taken from the official Russian blog SkypeUP: The developers indicated that they had hidden 2 more smiles, about which they were not mentioned anywhere. One smile was found = (wtf)
Another also = (hollest) (thanks
dazran ). I think that's not all.