Boost buddy
Two people with the common goal of cheaply acquiring Multi-player Achievements over XBox Live.
Acerbus KILLZ & Dollarbill04 are great Boost buddy's.
Buddy boost
A quick-recharge, high-alpine energy shot delivered by slamming a mouthful of your bro's protein-rich load. Comes in various flavors depending on what's served at base camp.
I was really struggling up the last few hundred vertical feet of that summit. Luckily my friend loaded me up with a buddy boost; it gave me the protein I needed for the final push!