1 Pack

When you are fat enough to only see a constant round belly area. and or cannot see any abs

-Look at my six pack, i was at the gym all day yesterday.
-look at my 1 pack, i got it from sitting on the couch and eating chips.

5&1/2 pack

when someone has abs that are slightly slanted or uneven, appearing as if half an ab is missing

never make fun of someone for having a 5&1/2 pack.
1. they will endlessly venture for their missing and elusive half-ab, ultimately leading to their demise
2. They still have 5&1/2 more abs than you