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1.
A "Full Tuck'!!!! Is when you get something (ANYTHING) to the MAX or the most or Best of any catagorie!!
Tony went to the deli and wanted Full Tuck Reuben (the works or everything on it!!!)

Or Justin went to the car dealership and bought a brand new Full Tuck Mustang and ordered it !!! (Loaded) !
by Shoe Guy 7 December 30, 2010
 
2.
A motorcycle riding position where the rider is "tucked" fully down and low behind the windshield. It is extremely aerodynamic.
"He's on a sport bike, of course he's riding full tuck in the triple digits."
by nobodyevenknows June 04, 2013