Guava Jelly/This Train (Marley Medly) Lyrics

Lyric discussion by rapture21 

Cover art for Guava Jelly/This Train (Marley Medly) lyrics by Sublime

I always thought 'the stone that the builder refuse, shall always be the headcorner stone" meant when somebody think's there to good for you or better than you and you end up the "headcorner stone". or something to that effect. Or am I way off?