A fork of Rural Dictionary
A highly intelligent human being that simply does not give a shit about the tasks at hand. Combination of the words "smart" and "sluff off".
Damn. Mike got a 1600 on his SATs and a 36 on his ACT. Instead of attending a top tier university like Duke or Harvard, Mike will be attending a community college 3 blocks from his house due to his 1.7 GPA. Mike's parents must be disappointed in their smuff off of a son.