a combination of the words "love" and "tackle" or "attack"
1. tackling to express love for a partner or friend in an enthusiastic manner
i.e. literally tackling, jumping hugs, picking up
2. tackling to express lust for a partner (or possible partner) in an enthusiastic or urgent manner
i.e. literally tackling, shoving against a wall, jumping on, picking up to throw on a bed
Note: a lovetack is almost always executed in a lighthearted way. By their very nature, lovetacks are immediately terminated if the receiver shows rejection or discomfort to the act.
Becca: "Sorry I'm late, Mike lovetacked me in the stairwell today."
Meg: "it's ok, you guys are cute."