In Old School Runescape, when General Graardor doesn't drop tassets after 300 KC and you're extremely annoyed with your bad RNG. The only thing that can help is listening to Vanessa Carlton - A Thousand Miles.
"Damn, Matt! Rune Platebody at 300KC... tell Graardor to stop being so peckish."
"Steve... throw on the rotation, bro."
it's an adjective used to describe the feeling when you're craving kisses or like... horny for a make out session. it doesn't usually go beyond that though. so it's only for kissing.
A: I really want some kisses rn
B: OH, you're feeling peckish?
A: peckish? what?
B: You're kiss horny...
A: oh... yeah... im peckish rn.