to go metal gear 

phrase derived from the popular video game Metal Gear Solid, which means to act in a stealthy manner, usually used when someone is attempting to avoid someone; another variant of this is to "go Spliter Cell" based on the new stealth video game of the same name.

1)That annoying asshole was looking for me, i had to go metal gear to get away

2)My brother was looking for me, so I went Splinter Cell and hid behind the counter.

to go metal gear by Koopa January 3, 2003