How do I disable all emoticons on incoming/outgoing text messages?
You can install a 3rd party SMS app called Handcent Next SMS which provides the option to disable emoticons on all (incoming/outgoing) sms.  

Install the app &rarr; Settings (inside app) &rarr; Custom style &rarr; Conversation settings &rarr; Disable&nbsp;smileys  

 
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Alternatively if you're on rooted android, you can recompile your Samsung Stock-Messages app (SecMmsCandy.apk) by deleting all the supporting pre-defined resource files and install back the modded version onto the phone although I'm not sure if it's such a good idea and most probably won't work, too. But if you're feeling adventurous here's the path
/system/priv-app/SecMms_Candy/SecMms_Candy.apk  


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