The word simply means Smiles Express. Visualize a train, a fast, or slow one, which gives you a smile. Maybe with it's contents or context (The circumstances that surround the existence of the content)
@ruzuzu I am new to this community, thanks for your comments. As I said it's your imagination, whether you imagine a spam, it's all in your mind. I'm not selling anything, or at least at present I'm not, so scamming doesn't really arise. I simply tweeted a word, which in itself is an imaginary one. I use it quite often, so it's very much real to me. The contents of the imaginary train may give you a smile, or maybe a frown. The glass is half full, for some it may be half empty. Thanks again and God Bless.