a long-standing good friend, one whom the speaker has shared many good times with; a buddy, a pal, a chum; what you say when an old buddy of yours walks into the room
The amazing alternative word for 'banana' invented by Hank Green at Crash Course because hey, language is weird and if Gretchen can make "fetch" happen we can make "chom choms" a thing.
A chomlette is a delicious omlette using a toping of crunched up cheetos (whichever variety you prefer). This type of food is usually eaten by students who do not know how to cook or are too poor to afford anything more than these basic items.
*Note this is also the favourite food of Felicia Day.
(Reference mega64 Microsoft keynote)