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2.
Masterbating, with your non-dominant hand. Much like a "friendly stranger", it supposedly gives one the feeling of being tugged by another person.
"If you're right-handed, why don't you jerk off with your right hand?"

"Because if you switch hit, it makes you cum faster."
by D. Gould June 08, 2006
 
1.
The sexual act when two couples are fucking in the same room and they switch partners. Normally, resulting in high fives from both males.
Eric and Joe were amazed at how quick the two girls were so eager to participate in a switch hit session.

"Ain 't nothing like a friendly game of switch hit."
by The Whisker Biscuit Basher July 09, 2005