Hefty generally means, large, huge, big, very, alot.
It is generally used to describe a large object or something similar.
The word Heavy in these areas can also mean the same, as does Pure and are commonly found in the same sentance.
'Check that hefty fat burd'
'Here bud check oot ma new sannies, hefty cool int they'
'Your a hefty bawbag'
You can make a hefty out of any alcohol, just use the same 2 to 1 ratio of alcohol and soda.